The reason I suggested hitman is that is specifically designed for the situation when the virus prevents you from using an anti-virus. Just try it. If it doesn't work, you don't have a crappy antivirus left on your computer (it doesn't require installation) like you would if you tried norton.
If for some reason that doesn't work, boot in safe mode and do the ESET online scan. It has pretty good results and, the last time I checked, they will remove the threats without a licence.