I don't know because you haven't told us anything about your computer. I understand that you are upset and am sympathetic, but you need to remember we can't see your computer from here.
Does the problem happen in all applications or just one? If the latter, which one? Do you have a laptop or a desktop? If you have a desktop, try a different keyboard. Does the problem go away? If you have a laptop, attach an external USB keyboard. Does the problem go away?
The First Question Of Troubleshooting: If the problem is new, what changed between the time things worked and the time they didn't?
Please come back with pertinent details about the problem and your computer so we can give you the focused help you want.
MS-MVP - Elephant Boy Computers - Don't Panic!