Well I would suggest you add one of the above (also see below) to compliment avast and improve overall detections.
If you haven’t already got this software (freeware), download, install, update and run it periodically.
- Ewido, a.k.a. avg anti-spyware If using winXP. or a-Squared free if using win98/ME.
- Ad-Aware SE Personal Edition
- Spybot Search and Destroy
- Spywareblaster Don’t install this until you are clean.
Whilst the windows XP firewall is usually good at keeping your ports stealthed (hidden) it provides no outbound protection and you should consider a third party firewall.
Any malware that manages to get past your defences will have free reign to connect to the internet to either download more of the same, pass your personal data (sensitive or otherwise, user names, passwords, keylogger retrieved data, etc.) or open a backdoor to your computer, so outbound protection is essential.