Over the last 24 hours lots of friends have been emailing and phoning about this “terrible virus”, so be aware of this before doing anything to your computer:

http://www.symantec.com/avcenter/venc/data/sulfnbk.exe.warning
edit: yet another link not working properly - this was the original, if you want to cut'n'paste -
http://www.symantec.com/avcenter/venc/data/sulfnbk.exe.warning.html