Vaio desktop won't even start up!!!

Question

Everytime I try to turn on my desktop computer it goes to a screen saying there is a file missing or corrupted.
WINDOWSSYSTEM32........... so on.
It tells me to run the setup cdrom disk but mine didnnot come with one.I have a recovery disk but it wont do a thing for me. If I hit any buttons the computer just restarts. What should I do?