DLL files have certain functions that help the programs in the computer run properly. One of these DLL files is the Msvcr120.dll_clr0400.dll. This particular DLL file is responsible for the extraction of the required resources during the installation of a program and is used when the program is launched or when games are launched in the C++ language. However, a number of users recently reported that they’ve encountered an error that says, “Msvcr120.dll_clr0400.dll is missing” when they tried to install an application or when they tried opening an application.
This kind of error could be due to several factors. It is possible that the DLL file is corrupted or there are some programs that interfere with the DLL file. On the other hand, it is also possible that it has been infected by a virus. To resolve this error, here are some potential fixes you need to check out:
The first thing you can do to fix the error is to try running the System File Checker or SFC scan. System File Checker is a command utility built into your computer that helps restore corrupted files and missing files. Refer to the following steps to run it:
The command will start a system scan which will take a few whiles before it finishes. Once it’s done, you could get the following results:
You can also troubleshoot the isDone.dll error in a Clean Boot state. It could be that there are some third-party applications in your computer that are preventing the application from getting installed and to isolate this possibility, you need to boot your computer in a Clean Boot State and then try installing the program again. Putting your computer in this state can help you identify which program is the culprit and thus isolates the problem. In a Clean Boot state, your computer will start using only the pre-selected minimal set of drivers and startup programs. Note that you have to disable and enable one process at a time.
You can also try to re-register the DLL to resolve the problem. The Regsvr32 tool is a command-line utility that can be used to register and unregister OLE controls like DLL and ActiveX (OCX) controls in the Windows operating system. Follow the steps below to use it.
Note: Replace “[DLL file]” with the name of the DLL file that was pointed out in the error.
The DLL file might also be infected with malware or virus and to eliminate it which could explain why you’re getting the “Msvcr120.dll_clr0400.dll is missing” error. Thus, you have to scan your computer using security programs like Windows Defender.

“The product key used on this PC didn’t work with this edition of Windows. Activation Error 0xC004F212.”Every time Microsoft generates a license for a copy of Windows, it is associated with one particular Windows variant. Windows comes in many editions like Enterprise, Home, Professional, and so on. For instance, if you bought a license for Windows 10 Enterprise but you have installed Windows 10 Professional instead, then the activation will surely fail and you’ll encounter the Activation Error 0xC004F212. You will be asked to select which edition you want to install when you reinstall Windows 10 using a digital license. If you opted for an edition other than the one you are licensed to use, then you will most likely get the Activation Error 0xC004F212. If you have purchased your license key from a store or some website, you might want to check back with them about the exact version of Windows. Doing so will help you narrow down the problem. And if you have second thoughts about the license key’s validity, you can just reach out to a Microsoft Support agent to check the validity of the license key. Also, if have bought it from the store, there should be an option to get a refund. That way you can choose to buy the right version of Windows.
[PID] Value=xxxxx-xxxxx-xxxxx-xxxxx-xxxxxNote: “xxxxx” is the KEY to your Windows version.
DISM /online /get-features /format:table | more
DISM /online /enable-feature /featurename:[Enter the name of the feature here] –AllNote: Now if you want to disable a feature that’s already enabled in your computer, refer to these sub-steps:
Get-WindowsOptionalFeature –Online
Get-WindowsOptionalFeature -Online -FeatureName *Type feature name*
Enable-WindowsOptionalFeature -Online -FeatureName “Type feature name” –all
Disable-WindowsOptionalFeature -Online -FeatureName “Type feature name”
“A secure connection cannot be established because this site uses an unsupported protocol, Error code ERR_SSL_VERSION_OR_CIPHER_MISMATCH”To resolve the ERR_SSL_VERSION_OR_CIPHER_MISMATCH error, refer to the options given below and see which one works for you.
"Cannot find the file sqlite3.dll (or one of its components)"
Followed by:
"Error starting program.. A required .DLL file sqlite3.dll was not found."
Error Causes
Error CausesCHKDSK [volume [[path] filename]] [/F] [/V] [/R] [/X] [/C] [: size]]Note: In the command given above, “[/F]” will try to fix the system errors while “[/R]” will be the one to fix the bad sectors.