Ok, to the problem. None of the .exe files (includes setups, apps) I've downloaded fairly recently have been opening! For example, when I try to open them, a window pops up saying "... has encountered a problem and needs to close." I've tried deactivating my anti-virus, restarting, and redownloading. Nothing I know works! The files work if I transfer them from another computer. Also, files downloaded before my computer started messing up are still working.
XP user, btw.