My computer hacked . what can I do now?

When I turn on my computer I would see a massage that tels me my computer hacked, every time I turn on my computer this messege showed again. I used many anti viros and anti spy but this messege come again, What can I do now? By shahram ASell your computer to me.

wipe the hard drive and reinstall!.
Try "System Restore". You can restore your system to a date before it hacked.
i would go with the first answer
its easy u should reinstal your widows and again instal your programs
and at this time be carefull a bout hackers
You have no option other than formatting the hard drive and reinstalling the OS