think my computer has been hijacked need help

ok i read what you wanted me too, im new to all of this, all i know is that my computer poped up some stuff and some music started playing and there was a message that said " you are screwed" then my computer shut off. I then ran spybot s&d and nothing came up, then about an hr later i ran old aol spyware that is still on my computer and it had 2 threats.... Mirar status toolbar potential threat nuisance...the 2nd was ISTbar status Hijacker potential threat Security. I know this is not what you wanted but if you could help me find what you want, I would appreciate your help and time helping me make get rid of this problem. Or to make sure it is gone.
 
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