Problems with messed up registry!!

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Wow, I feel like such and idiot right now. I need help badly. I was having a problem with my computer which I think was a worm or something. I cant be sure but it was really low on memory and having tons of problems. I think it may have come from using myspace?? I went myself to regedit and removed some exe files and lots of things that said shell. I think I really did it this time bc anything I click on my desktop or any downloads i try to do come back with errors, a small box that says acess to specific path or file denied. I cant even go to backup it shows me the same thing. I can go on the internet but thats about it. How can I restore my reg keys. Thanks, any help is appreciated!