bankerfox.a virus?

All of a sudden, I have started getting popups that say my computer is infected and even when I try to install hijackthis, it says that file is infected and doesn't let it install. I am unable to run any other program, like Task Manager etc. Please help since I am unable to install anything on my computer and get rid of this.

Hello.

Please visit this webpage for instructions for downloading and running ComboFix:

http://www.bleepingcomputer.com/combofix/how-to-use-combofix

Post the log from ComboFix when you've accomplished that.