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Compare Exchange128 error – What is it
Some Windows 7 and Windows 8.1 users reported experiencing a CompareExchange128 error when trying to upgrade to Windows 10. The error reads, “You can’t install Windows 10 because your processor doesn’t support CompareExchange128”. In order to upgrade to Windows 10 (64-bit), the CMPXCHG16B instruction must be present. If you receive this error, this mostly means that your CPU doesn’t have the CMPXCHG16B instruction.
Solution
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The CompareExchange128 error normally occurs due to two possible reasons:
Error Causes
One main requirement to upgrade to Windows 10 is for your CPU to have the CMPXCHG16b instruction. You also need the right BIOS version to guarantee a smooth installation. See below on how to manually fix this issue. NOTE: If you don’t feel confident using the manual methods listed below, it’s highly advisable to get help from an expert technician. If you don’t know someone, you can also use an automated tool to fix this. Before performing any fixes, try to determine first if the cause of the error is due to your CPU lacking the CMPXCHG16b instruction. You can use a CPU Info tool that provides complete details about your processor, memory, and motherboard. If you’re looking for more in-depth information, you might also try command line utilities. But, the safest and easiest way to check this is by simply searching online. Try using the search query: <CPU Model> CMPXCHG16b This method will download the latest BIOS from your motherboard’s manufacturer. This makes sure your CPU has the CMPXCHG16b instruction needed to complete the Windows 10 64-bit installation. To update your computer’s BIOS, complete the following steps: If updating the BIOS doesn’t work, what you can do is install a 32-bit version of Windows 10 instead of the 64-bit version. Here’s how to do this: If the above two methods don’t work, there’s a great chance that this error occurs because of an outdated processor/motherboard. YouR next possible solution is to buy an updated model that’s fully compatible with 64-bit Windows 10. If all else fails, you might want to consider using this powerful automated tool to quickly fix the problem and any other computer related issues.
Further Information and Manual Repair
Method 1 – Update your BIOS
Method 2 – Install Windows 10 32-bit version
Method 3 – Buy a new processor/motherboard
Method 4 – Download an automated tool