guys....i found out combofix written by subs, its pretty good.
warning: its very good but its rather intrusive in its way.
it changes my desktop and closes everything before running, but everything will be back to normal after restart. i was infected with win32/heur type virus. blocked my avg from updating, blocked most rootkits scanners from installing. downloaded it from my laptop copied into my pc...changed it to a generic name so that the virus doesn't detect it.
killed the rootkit on the first run, then leaved behind the rest of the cleaning job to my avg.
Virus/Malware Virus /Rootkits Thread, Work In Progress