Try using “Stinger” by Mcafee. Search A.V.E.R.T On Yahoo. It got Rid of Worm Sasser.B on the first Try. I Downloaded "Download Accelerator Plus"Because it has resume. It was shutting Down My Computer every few Minutes. I shut Down My computer Before The Virus Did and Left It Off For About An Hour .Then Was able to Download “Stinger”. 
Good Luck,
owlman_1