Help! Trojan Small-amt

[Jessica Leigh]

anyone know how to get rid of this? it's having a lot of fun hijacking my browser and taking me to lots of nasty nasty sites and trying to get me to gamble and buy cigarettes and penis enlargers online and worst of all... it put a photoshopped pic of britney spears on an icon on my desktop which i can delete but magically comes back 30 seconds later.... i'm getting pissed. my comp is still working normally except for those things.

all virus/spyware scanners that i have tried have either not found it or freeze up in the middle of the scan. housecall.trendmicro.com has found the location of the virus but says it is uncleanable... NOW WHAT DO I DO!!?? i know some of you know way more about this than i do so please... HELP ME!!!