Possible Duplicate:
How do you associate the .exe file extension with a program in Windows?
I recently booted my computer and all of the executable files have turned into 7zip icons. A hoard of error messages popped up upon startup stating that 7zip could not open the files. 1: How do I restore this problem so I can open my programs and my computer will boot normally? 2: What caused this and how do I prevent this from coming back? Any help would be great.