well I recommend doing everything ASAP while on the internet, key loggers, and back door control could be put into place
throw away emails are good
the easiest solution would be to backup any mp3s, txts, bl addon folder, stuff like that and do a full OS re installation, make sure you don't backup and exe's if you do this though
Start it in safemode and delete it.
Don't do this, you can't
the root kit has infected a necessary Operating system file you can't just delete it, and it will continue to run in safe mode