won't let me run any program

i got virus =( and it won't let me run any programs so i can't run antivirus programs, it always says access denied etc etc. i run win xp, how do i get rid of it, i got the virus from gamebooster also cuz it downloaded a toolbar and some other stuff. and i cant go on internet cuz it always redirects me if i use a search engine, only if i type in sites i know

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