i have a pop up blocker, anti virus, firewall, spyware detector and it still pops up. its not a website its just a small annoying window that pops up telling me i have errors in my registry and i need to go to their website to fix my registery any help!!!!

I use AVG internet security already which is quite comprehensive, has anti virus, firewall,, anti spyware etc etc. but are they any other programs you would recommend?

Ie a registry cleaner, a trojan remove etc etc?