My son's desktop computer has been running really slow. Thought maybe it was a virus or just too much on it. It shows plenty of memory available so I bought and loaded McAfee hoping to "catch" what ever virus was causing it to go slow.
After loading, however, I have a new problem. Any time I try to open a Microsoft program (Word, Excel) I get an error message: "not designed to run on Windows or it contains an error. Try installing the program again using the original installation media or contact your system administrator or the software vendor for support. Error status 0xc000012f."
Micosoft was preloaded on the hard drive when I purchased it. I've tried uninstall/reinstall from the internet and it says there was an error and nothing was changed.
How do I fix this?