Hi Calvanom,
Please follow Neal's advice plus the following generic advice:
Please ensure you have done a thorough scan with avast!, preferably a boot time scan. (This doesn't work in Win 98: if you have this OS, boot into safe mode before scanning- hit F8 while booting.)
Right click the avast! globe and select Start avast! Antivirus.
avast! will do a memory scan: if it find the worm in memory, it will prompt you to do a boot time scan: accept this and reboot.
If avast! doesn't find anything in memory, schedule a boot time scan. (Click the button at the top left of the avast! silver console and select Schedule boot time scan from the drop-down menu.)
The anti-Trojan program Ewido is also worth trying: it has a free version:
http://www.ewido.net/en/Please ensure that you have a firewall and that your OS is up to date, otherwise infections will come back.
If you need advice on either of these subjects, please say so.
If you still experience problems, please run HijackThis and post a log file:
http://www.bleepingcomputer.com/forums/tutorial42.html