I actually read about this one this afternoon...
It's a rapidly spreading worm
Storm Worm's virulence may change tactics - Network World
Most likely a biproduct of the Storm Worm
"Known as Friends Greeting or worm_friendgrt.B", according to PC World
PC World - Friendly Greeting Hides Worm has instructions on removal, but I don't know if that will help...seems to me that a worm wouldn't uninstall that easily.
I do agree with NeedKarma. A good antivirus with updates, run a full system scan in safe mode, should take care of it. If you don't have an antivirus, I'd reccomend AVG, by Grisoft. It's free.