I'll leave it to the experts but I was able to clean things up using combofix - but I renamed the file when I downloaded it via firefox to combo-fix.exe... that seemed to let me run it when I had the same problem. Combofix cleaned the virus and I as then able to run hijackthis and MBM to clean up the rest of the mess... hope that helps!
Combo-fix will begin to load, when the green bar is full the screen will flash then turn off Combo-fix.
I have more bad news now, looks like I'm also infected with Windows anti-virus pro (also System Security is trying to install). Sometimes I get lucky and manage to log onto process explorer quick enough to stop them from fully loading.
(Windows anti virus pro, plus System Security block the task managers. While PC_Antispyware2010 blocks all of my "helper" programs; pretty mean 1 2 punch )