Activating photo viewer
How technically photo viewer is still in the system but not used we will have to make it available again and this we will do by adding some lines in the Windows registry, that being said, open a notepad and paste the following code as it is in it.Windows Registry Editor Version 5.00 [HKEY_CLASSES_ROOT\jpegfile\shell\open\DropTarget] "Clsid"="{FFE2A43C-56B9-4bf5-9A79-CC6D4285608A}" [HKEY_CLASSES_ROOT\pngfile\shell\open\DropTarget] "Clsid"="{FFE2A43C-56B9-4bf5-9A79-CC6D4285608A}" [HKEY_CLASSES_ROOT\Applications\photoviewer.dll\shell\open] "MuiVerb"="@photoviewer.dll,-3043" [HKEY_CLASSES_ROOT\Applications\photoviewer.dll\shell\open\command] @=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,\ 00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,72,00,75,00,\ 6e,00,64,00,6c,00,6c,00,33,00,32,00,2e,00,65,00,78,00,65,00,20,00,22,00,25,\ 00,50,00,72,00,6f,00,67,00,72,00,61,00,6d,00,46,00,69,00,6c,00,65,00,73,00,\ 25,00,5c,00,57,00,69,00,6e,00,64,00,6f,00,77,00,73,00,20,00,50,00,68,00,6f,\ 00,74,00,6f,00,20,00,56,00,69,00,65,00,77,00,65,00,72,00,5c,00,50,00,68,00,\ 6f,00,74,00,6f,00,56,00,69,00,65,00,77,00,65,00,72,00,2e,00,64,00,6c,00,6c,\ 00,22,00,2c,00,20,00,49,00,6d,00,61,00,67,00,65,00,56,00,69,00,65,00,77,00,\ 5f,00,46,00,75,00,6c,00,6c,00,73,00,63,00,72,00,65,00,65,00,6e,00,20,00,25,\ 00,31,00,00,00 [HKEY_CLASSES_ROOT\Applications\photoviewer.dll\shell\open\DropTarget] "Clsid"="{FFE2A43C-56B9-4bf5-9A79-CC6D4285608A}" [HKEY_CLASSES_ROOT\PhotoViewer.FileAssoc.Bitmap] "ImageOptionFlags"=dword:00000001 "FriendlyTypeName"=hex(2):40,00,25,00,50,00,72,00,6f,00,67,00,72,00,61,00,6d,\ 00,46,00,69,00,6c,00,65,00,73,00,25,00,5c,00,57,00,69,00,6e,00,64,00,6f,00,\ 77,00,73,00,20,00,50,00,68,00,6f,00,74,00,6f,00,20,00,56,00,69,00,65,00,77,\ 00,65,00,72,00,5c,00,50,00,68,00,6f,00,74,00,6f,00,56,00,69,00,65,00,77,00,\ 65,00,72,00,2e,00,64,00,6c,00,6c,00,2c,00,2d,00,33,00,30,00,35,00,36,00,00,\ 00 [HKEY_CLASSES_ROOT\PhotoViewer.FileAssoc.Bitmap\DefaultIcon] @="%SystemRoot%\\System32\\imageres.dll,-70" [HKEY_CLASSES_ROOT\PhotoViewer.FileAssoc.Bitmap\shell\open\command] @=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,\ 00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,72,00,75,00,\ 6e,00,64,00,6c,00,6c,00,33,00,32,00,2e,00,65,00,78,00,65,00,20,00,22,00,25,\ 00,50,00,72,00,6f,00,67,00,72,00,61,00,6d,00,46,00,69,00,6c,00,65,00,73,00,\ 25,00,5c,00,57,00,69,00,6e,00,64,00,6f,00,77,00,73,00,20,00,50,00,68,00,6f,\ 00,74,00,6f,00,20,00,56,00,69,00,65,00,77,00,65,00,72,00,5c,00,50,00,68,00,\ 6f,00,74,00,6f,00,56,00,69,00,65,00,77,00,65,00,72,00,2e,00,64,00,6c,00,6c,\ 00,22,00,2c,00,20,00,49,00,6d,00,61,00,67,00,65,00,56,00,69,00,65,00,77,00,\ 5f,00,46,00,75,00,6c,00,6c,00,73,00,63,00,72,00,65,00,65,00,6e,00,20,00,25,\ 00,31,00,00,00 [HKEY_CLASSES_ROOT\PhotoViewer.FileAssoc.Bitmap\shell\open\DropTarget] "Clsid"="{FFE2A43C-56B9-4bf5-9A79-CC6D4285608A}" [HKEY_CLASSES_ROOT\Applications\photoviewer.dll\shell\print] "NeverDefault"="" [HKEY_CLASSES_ROOT\Applications\photoviewer.dll\shell\print\command] @=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,\ 00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,72,00,75,00,\ 6e,00,64,00,6c,00,6c,00,33,00,32,00,2e,00,65,00,78,00,65,00,20,00,22,00,25,\ 00,50,00,72,00,6f,00,67,00,72,00,61,00,6d,00,46,00,69,00,6c,00,65,00,73,00,\ 25,00,5c,00,57,00,69,00,6e,00,64,00,6f,00,77,00,73,00,20,00,50,00,68,00,6f,\ 00,74,00,6f,00,20,00,56,00,69,00,65,00,77,00,65,00,72,00,5c,00,50,00,68,00,\ 6f,00,74,00,6f,00,56,00,69,00,65,00,77,00,65,00,72,00,2e,00,64,00,6c,00,6c,\ 00,22,00,2c,00,20,00,49,00,6d,00,61,00,67,00,65,00,56,00,69,00,65,00,77,00,\ 5f,00,46,00,75,00,6c,00,6c,00,73,00,63,00,72,00,65,00,65,00,6e,00,20,00,25,\ 00,31,00,00,00 [HKEY_CLASSES_ROOT\Applications\photoviewer.dll\shell\print\DropTarget] "Clsid"="{60fd46de-f830-4894-a628-6fa81bc0190d}" [HKEY_CLASSES_ROOT\PhotoViewer.FileAssoc.JFIF] "EditFlags"=dword:00010000 "ImageOptionFlags"=dword:00000001 "FriendlyTypeName"=hex(2):40,00,25,00,50,00,72,00,6f,00,67,00,72,00,61,00,6d,\ 00,46,00,69,00,6c,00,65,00,73,00,25,00,5c,00,57,00,69,00,6e,00,64,00,6f,00,\ 77,00,73,00,20,00,50,00,68,00,6f,00,74,00,6f,00,20,00,56,00,69,00,65,00,77,\ 00,65,00,72,00,5c,00,50,00,68,00,6f,00,74,00,6f,00,56,00,69,00,65,00,77,00,\ 65,00,72,00,2e,00,64,00,6c,00,6c,00,2c,00,2d,00,33,00,30,00,35,00,35,00,00,\ 00 [HKEY_CLASSES_ROOT\PhotoViewer.FileAssoc.JFIF\DefaultIcon] @="%SystemRoot%\\System32\\imageres.dll,-72" [HKEY_CLASSES_ROOT\PhotoViewer.FileAssoc.JFIF\shell\open] "MuiVerb"=hex(2):40,00,25,00,50,00,72,00,6f,00,67,00,72,00,61,00,6d,00,46,00,\ 69,00,6c,00,65,00,73,00,25,00,5c,00,57,00,69,00,6e,00,64,00,6f,00,77,00,73,\ 00,20,00,50,00,68,00,6f,00,74,00,6f,00,20,00,56,00,69,00,65,00,77,00,65,00,\ 72,00,5c,00,70,00,68,00,6f,00,74,00,6f,00,76,00,69,00,65,00,77,00,65,00,72,\ 00,2e,00,64,00,6c,00,6c,00,2c,00,2d,00,33,00,30,00,34,00,33,00,00,00 [HKEY_CLASSES_ROOT\PhotoViewer.FileAssoc.JFIF\shell\open\command] @=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,\ 00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,72,00,75,00,\ 6e,00,64,00,6c,00,6c,00,33,00,32,00,2e,00,65,00,78,00,65,00,20,00,22,00,25,\ 00,50,00,72,00,6f,00,67,00,72,00,61,00,6d,00,46,00,69,00,6c,00,65,00,73,00,\ 25,00,5c,00,57,00,69,00,6e,00,64,00,6f,00,77,00,73,00,20,00,50,00,68,00,6f,\ 00,74,00,6f,00,20,00,56,00,69,00,65,00,77,00,65,00,72,00,5c,00,50,00,68,00,\ 6f,00,74,00,6f,00,56,00,69,00,65,00,77,00,65,00,72,00,2e,00,64,00,6c,00,6c,\ 00,22,00,2c,00,20,00,49,00,6d,00,61,00,67,00,65,00,56,00,69,00,65,00,77,00,\ 5f,00,46,00,75,00,6c,00,6c,00,73,00,63,00,72,00,65,00,65,00,6e,00,20,00,25,\ 00,31,00,00,00 [HKEY_CLASSES_ROOT\PhotoViewer.FileAssoc.JFIF\shell\open\DropTarget] "Clsid"="{FFE2A43C-56B9-4bf5-9A79-CC6D4285608A}" [HKEY_CLASSES_ROOT\PhotoViewer.FileAssoc.Jpeg] "EditFlags"=dword:00010000 "ImageOptionFlags"=dword:00000001 "FriendlyTypeName"=hex(2):40,00,25,00,50,00,72,00,6f,00,67,00,72,00,61,00,6d,\ 00,46,00,69,00,6c,00,65,00,73,00,25,00,5c,00,57,00,69,00,6e,00,64,00,6f,00,\ 77,00,73,00,20,00,50,00,68,00,6f,00,74,00,6f,00,20,00,56,00,69,00,65,00,77,\ 00,65,00,72,00,5c,00,50,00,68,00,6f,00,74,00,6f,00,56,00,69,00,65,00,77,00,\ 65,00,72,00,2e,00,64,00,6c,00,6c,00,2c,00,2d,00,33,00,30,00,35,00,35,00,00,\ 00 [HKEY_CLASSES_ROOT\PhotoViewer.FileAssoc.Jpeg\DefaultIcon] @="%SystemRoot%\\System32\\imageres.dll,-72" [HKEY_CLASSES_ROOT\PhotoViewer.FileAssoc.Jpeg\shell\open] "MuiVerb"=hex(2):40,00,25,00,50,00,72,00,6f,00,67,00,72,00,61,00,6d,00,46,00,\ 69,00,6c,00,65,00,73,00,25,00,5c,00,57,00,69,00,6e,00,64,00,6f,00,77,00,73,\ 00,20,00,50,00,68,00,6f,00,74,00,6f,00,20,00,56,00,69,00,65,00,77,00,65,00,\ 72,00,5c,00,70,00,68,00,6f,00,74,00,6f,00,76,00,69,00,65,00,77,00,65,00,72,\ 00,2e,00,64,00,6c,00,6c,00,2c,00,2d,00,33,00,30,00,34,00,33,00,00,00 [HKEY_CLASSES_ROOT\PhotoViewer.FileAssoc.Jpeg\shell\open\command] @=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,\ 00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,72,00,75,00,\ 6e,00,64,00,6c,00,6c,00,33,00,32,00,2e,00,65,00,78,00,65,00,20,00,22,00,25,\ 00,50,00,72,00,6f,00,67,00,72,00,61,00,6d,00,46,00,69,00,6c,00,65,00,73,00,\ 25,00,5c,00,57,00,69,00,6e,00,64,00,6f,00,77,00,73,00,20,00,50,00,68,00,6f,\ 00,74,00,6f,00,20,00,56,00,69,00,65,00,77,00,65,00,72,00,5c,00,50,00,68,00,\ 6f,00,74,00,6f,00,56,00,69,00,65,00,77,00,65,00,72,00,2e,00,64,00,6c,00,6c,\ 00,22,00,2c,00,20,00,49,00,6d,00,61,00,67,00,65,00,56,00,69,00,65,00,77,00,\ 5f,00,46,00,75,00,6c,00,6c,00,73,00,63,00,72,00,65,00,65,00,6e,00,20,00,25,\ 00,31,00,00,00 [HKEY_CLASSES_ROOT\PhotoViewer.FileAssoc.Jpeg\shell\open\DropTarget] "Clsid"="{FFE2A43C-56B9-4bf5-9A79-CC6D4285608A}" [HKEY_CLASSES_ROOT\PhotoViewer.FileAssoc.Gif] "ImageOptionFlags"=dword:00000001 "FriendlyTypeName"=hex(2):40,00,25,00,50,00,72,00,6f,00,67,00,72,00,61,00,6d,\ 00,46,00,69,00,6c,00,65,00,73,00,25,00,5c,00,57,00,69,00,6e,00,64,00,6f,00,\ 77,00,73,00,20,00,50,00,68,00,6f,00,74,00,6f,00,20,00,56,00,69,00,65,00,77,\ 00,65,00,72,00,5c,00,50,00,68,00,6f,00,74,00,6f,00,56,00,69,00,65,00,77,00,\ 65,00,72,00,2e,00,64,00,6c,00,6c,00,2c,00,2d,00,33,00,30,00,35,00,37,00,00,\ 00 [HKEY_CLASSES_ROOT\PhotoViewer.FileAssoc.Gif\DefaultIcon] @="%SystemRoot%\\System32\\imageres.dll,-83" [HKEY_CLASSES_ROOT\PhotoViewer.FileAssoc.Gif\shell\open\command] @=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,\ 00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,72,00,75,00,\ 6e,00,64,00,6c,00,6c,00,33,00,32,00,2e,00,65,00,78,00,65,00,20,00,22,00,25,\ 00,50,00,72,00,6f,00,67,00,72,00,61,00,6d,00,46,00,69,00,6c,00,65,00,73,00,\ 25,00,5c,00,57,00,69,00,6e,00,64,00,6f,00,77,00,73,00,20,00,50,00,68,00,6f,\ 00,74,00,6f,00,20,00,56,00,69,00,65,00,77,00,65,00,72,00,5c,00,50,00,68,00,\ 6f,00,74,00,6f,00,56,00,69,00,65,00,77,00,65,00,72,00,2e,00,64,00,6c,00,6c,\ 00,22,00,2c,00,20,00,49,00,6d,00,61,00,67,00,65,00,56,00,69,00,65,00,77,00,\ 5f,00,46,00,75,00,6c,00,6c,00,73,00,63,00,72,00,65,00,65,00,6e,00,20,00,25,\ 00,31,00,00,00 [HKEY_CLASSES_ROOT\PhotoViewer.FileAssoc.Gif\shell\open\DropTarget] "Clsid"="{FFE2A43C-56B9-4bf5-9A79-CC6D4285608A}" [HKEY_CLASSES_ROOT\PhotoViewer.FileAssoc.Png] "ImageOptionFlags"=dword:00000001 "FriendlyTypeName"=hex(2):40,00,25,00,50,00,72,00,6f,00,67,00,72,00,61,00,6d,\ 00,46,00,69,00,6c,00,65,00,73,00,25,00,5c,00,57,00,69,00,6e,00,64,00,6f,00,\ 77,00,73,00,20,00,50,00,68,00,6f,00,74,00,6f,00,20,00,56,00,69,00,65,00,77,\ 00,65,00,72,00,5c,00,50,00,68,00,6f,00,74,00,6f,00,56,00,69,00,65,00,77,00,\ 65,00,72,00,2e,00,64,00,6c,00,6c,00,2c,00,2d,00,33,00,30,00,35,00,37,00,00,\ 00 [HKEY_CLASSES_ROOT\PhotoViewer.FileAssoc.Png\DefaultIcon] @="%SystemRoot%\\System32\\imageres.dll,-71" [HKEY_CLASSES_ROOT\PhotoViewer.FileAssoc.Png\shell\open\command] @=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,\ 00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,72,00,75,00,\ 6e,00,64,00,6c,00,6c,00,33,00,32,00,2e,00,65,00,78,00,65,00,20,00,22,00,25,\ 00,50,00,72,00,6f,00,67,00,72,00,61,00,6d,00,46,00,69,00,6c,00,65,00,73,00,\ 25,00,5c,00,57,00,69,00,6e,00,64,00,6f,00,77,00,73,00,20,00,50,00,68,00,6f,\ 00,74,00,6f,00,20,00,56,00,69,00,65,00,77,00,65,00,72,00,5c,00,50,00,68,00,\ 6f,00,74,00,6f,00,56,00,69,00,65,00,77,00,65,00,72,00,2e,00,64,00,6c,00,6c,\ 00,22,00,2c,00,20,00,49,00,6d,00,61,00,67,00,65,00,56,00,69,00,65,00,77,00,\ 5f,00,46,00,75,00,6c,00,6c,00,73,00,63,00,72,00,65,00,65,00,6e,00,20,00,25,\ 00,31,00,00,00 [HKEY_CLASSES_ROOT\PhotoViewer.FileAssoc.Png\shell\open\DropTarget] "Clsid"="{FFE2A43C-56B9-4bf5-9A79-CC6D4285608A}" [HKEY_CLASSES_ROOT\PhotoViewer.FileAssoc.Wdp] "EditFlags"=dword:00010000 "ImageOptionFlags"=dword:00000001 [HKEY_CLASSES_ROOT\PhotoViewer.FileAssoc.Wdp\DefaultIcon] @="%SystemRoot%\\System32\\wmphoto.dll,-400" [HKEY_CLASSES_ROOT\PhotoViewer.FileAssoc.Wdp\shell\open] "MuiVerb"=hex(2):40,00,25,00,50,00,72,00,6f,00,67,00,72,00,61,00,6d,00,46,00,\ 69,00,6c,00,65,00,73,00,25,00,5c,00,57,00,69,00,6e,00,64,00,6f,00,77,00,73,\ 00,20,00,50,00,68,00,6f,00,74,00,6f,00,20,00,56,00,69,00,65,00,77,00,65,00,\ 72,00,5c,00,70,00,68,00,6f,00,74,00,6f,00,76,00,69,00,65,00,77,00,65,00,72,\ 00,2e,00,64,00,6c,00,6c,00,2c,00,2d,00,33,00,30,00,34,00,33,00,00,00 [HKEY_CLASSES_ROOT\PhotoViewer.FileAssoc.Wdp\shell\open\command] @=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,\ 00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,72,00,75,00,\ 6e,00,64,00,6c,00,6c,00,33,00,32,00,2e,00,65,00,78,00,65,00,20,00,22,00,25,\ 00,50,00,72,00,6f,00,67,00,72,00,61,00,6d,00,46,00,69,00,6c,00,65,00,73,00,\ 25,00,5c,00,57,00,69,00,6e,00,64,00,6f,00,77,00,73,00,20,00,50,00,68,00,6f,\ 00,74,00,6f,00,20,00,56,00,69,00,65,00,77,00,65,00,72,00,5c,00,50,00,68,00,\ 6f,00,74,00,6f,00,56,00,69,00,65,00,77,00,65,00,72,00,2e,00,64,00,6c,00,6c,\ 00,22,00,2c,00,20,00,49,00,6d,00,61,00,67,00,65,00,56,00,69,00,65,00,77,00,\ 5f,00,46,00,75,00,6c,00,6c,00,73,00,63,00,72,00,65,00,65,00,6e,00,20,00,25,\ 00,31,00,00,00 [HKEY_CLASSES_ROOT\PhotoViewer.FileAssoc.Wdp\shell\open\DropTarget] "Clsid"="{FFE2A43C-56B9-4bf5-9A79-CC6D4285608A}" [HKEY_CLASSES_ROOT\SystemFileAssociations\image\shell\Image Preview\command] @=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,\ 00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,72,00,75,00,\ 6e,00,64,00,6c,00,6c,00,33,00,32,00,2e,00,65,00,78,00,65,00,20,00,22,00,25,\ 00,50,00,72,00,6f,00,67,00,72,00,61,00,6d,00,46,00,69,00,6c,00,65,00,73,00,\ 25,00,5c,00,57,00,69,00,6e,00,64,00,6f,00,77,00,73,00,20,00,50,00,68,00,6f,\ 00,74,00,6f,00,20,00,56,00,69,00,65,00,77,00,65,00,72,00,5c,00,50,00,68,00,\ 6f,00,74,00,6f,00,56,00,69,00,65,00,77,00,65,00,72,00,2e,00,64,00,6c,00,6c,\ 00,22,00,2c,00,20,00,49,00,6d,00,61,00,67,00,65,00,56,00,69,00,65,00,77,00,\ 5f,00,46,00,75,00,6c,00,6c,00,73,00,63,00,72,00,65,00,65,00,6e,00,20,00,25,\ 00,31,00,00,00 [HKEY_CLASSES_ROOT\SystemFileAssociations\image\shell\Image Preview\DropTarget] "{FFE2A43C-56B9-4bf5-9A79-CC6D4285608A}"="" [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Photo Viewer\Capabilities] "ApplicationDescription"="@%ProgramFiles%\\Windows Photo Viewer\\photoviewer.dll,-3069" "ApplicationName"="@%ProgramFiles%\\Windows Photo Viewer\\photoviewer.dll,-3009" [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Photo Viewer\Capabilities\FileAssociations] ".cr2"="PhotoViewer.FileAssoc.Tiff" ".jpg"="PhotoViewer.FileAssoc.Jpeg" ".wdp"="PhotoViewer.FileAssoc.Wdp" ".jfif"="PhotoViewer.FileAssoc.JFIF" ".dib"="PhotoViewer.FileAssoc.Bitmap" ".png"="PhotoViewer.FileAssoc.Png" ".jxr"="PhotoViewer.FileAssoc.Wdp" ".bmp"="PhotoViewer.FileAssoc.Bitmap" ".jpe"="PhotoViewer.FileAssoc.Jpeg" ".jpeg"="PhotoViewer.FileAssoc.Jpeg" ".gif"="PhotoViewer.FileAssoc.Gif" ".tif"="PhotoViewer.FileAssoc.Tiff" ".tiff"="PhotoViewer.FileAssoc.Tiff"
Yup, that is a lot of keys and settings but you are almost done. Once you have pasted text into your new notepad document save it but as .REG, you can name it however you want but it has to be .REG extension. Once the file is saved double click on it to merge it into the Windows registry. You might need to turn off UAC for this operation (check our tutorial on this topic) and accept warning messages but once it is done you should now have an old photo viewer as a choice for your default viewing application. All you have to do now is to go to settings and go to default apps, under photo viewer you should see your current default viewing application, probably photos, click on it to see options and choose photo viewer and exit the Settings menu, and you're done.


Many Linux users if not all of them can run their distros from a USB drive but did you know you can run Windows 10 from a USB drive as well?
Microsoft has introduced all the way back to Windows 8 one feature called Windows To Go and it kept it in Windows 8.1 and in Windows 10 as well.
This feature is intended as a convenient way for workers to carry their corporate environments with them, but having your own copy of Windows on a thumb drive could be handy for backup purposes, too, or if you frequently use public machines that lack your preferences/applications or that have a restricted OS.
