[HELP] I screwed up my other computer!!!

Okay so I downloaded a registry error fixing thing and used it without creating a restore point and it deleted a bunch of shit that I need to get on internet and everything else it deleted stuff from my system32 file!!! How do I fix this and make my computer back to normal?! And dont say reinstall the Windows disk because I dont have a Windows disk to install... It fucked up my computer I need help!

system restore?

start > all programs > accesories > system tools> system restore


if it doesnt work, then u r fucked