TSGL: virus

[gene]

Hello everyone,
I have got a big problem that i hope someone can possibly help me with.
I scanned my computer with bit defender anti virus that isn't so much 
anti.It found a virus called, win32.virtob.3.gen, and said it 
couldn't get rid of it.
I have since tried avg, nod32, trend micro and dr. web, two never 
heard of it, one seen it but couldn't get rid of it and the last one 
found it and said to check around to see if i could find something 
else to delete it.
I don't know what to do next to reformatting windows xp. and I'd 
rather not do that.
Appreciate any help you can give me,
Gene