How will System Restore affect me in my situation?

A few days ago I got the smitfraud virus (The one that changes your desktop background) and did everything I know to get rid of it. I'm currently no longer plagued by the background changes and rampant popups, but my computer's been performing very slowly, and I get a few random pop-ups every now and then.

Which brings me to my point; If I system restore to a time before I ever got the virus, would my computer's performance improve? I've tried everything, and I'm still being plagued by the sluggishness. Once more, my antivrus programs still detect the same viruses on my system whenever I run them.

I just want this nightmare to be over... What will system restore do?

 

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