i cant install windows 8.1 or 10 on my pc

Hello everyone... I posted this thread earlier but no replies , my pc is giving a problem that i cant install Windows 8.1 or Windows 10... i am currently using Windows 8 pro... it says that my pc does not support compare exchange128.

Microsoft confirms some older AMD processors do not support Windows 8.1

(It applies to Windows 10 as well.)

The CompareExchange128 instruction requirement was added for Windows 8.1 and latter to run a 64 bit OS. There is no possible workaround. You should be able to install a 32 bit OS but this is hard to tell for sure from your unknown system specs. Posting system specs, particularly what CPU you have, would help.