Don't have any anti-spyware progs installed at the moment and sensitivity level of stnadard shield is high.
Normal provides a balance between performance and protection, it should be fine for normal everyday use, especially since you should have the other resident scanners, Web Shield, Internet mail, etc. in front of that as well.
I never get spyware, even after doing a scan with Adaware after downloading it didn't find any.
Never say never, prevention is much better than cure so anti-spyware gives an additional string to your security bow.
If you haven't already got this software (freeware), download, install, update and run it, preferably in safe mode.
1.
Ad-Aware2.
Spybot Search and Destroy3.
Spywareblaster Don't install this until you are clean.
Be aware that the Sygate firewall (not sure about the Pro version) has a localhost loop back vulnerability. The Web Shield monitors http traffic via a localhost proxy and sygate detects that web shield proxy but is unable to detect what program is using it, so it won't interrogate new programs (possibly malware) which are going through the web shield proxy.
How to disable transparent web shield proxy and allow only those browsers you want use it:
In avast! go to Web Shield provider, Customize..., Basic tab, blank the redirected HTTP port field (remove the 80). Now no browser (or other http protocol traffic) can use web shield unless you manually configure it to use Web Shield.