Need really fast help [really technical]

I know this isnt the right section but i need help, like now. I was trying to fix my Microsoft office error. And when i was on regedit I accidentally deleted "Microsoft" instead of "Office" now i cant run any microsoft application (cmd system restore .ect) i havnt restarted becuase i dont wanna make it worse... i think i made a reg backup a while back, but idk where it saved.