How do I get rid of mighty max pop-up (registry cleaner) you know the free scan, deal, that won't go away.

I think it is a virus

Run the anti spyware remove programs spybot
Security News from the net: Spybot search and destroy spyware and popups

And superantispyware
Security News from the net: SUPERAntiSpyware Home Edition (free version)
To get rid of the nasties

Finally do a thorough scan with the FREE Dr.Web CureIt! Utility
Download Dr.Web CureIt! Free anti-virus scanner, cures computers viruses.