..you need to make sure that ZoneAlarm and the Windows XP firewall are NOT running at the same time..Usually ZA will actually turn off the Windows firewall but verify that by opening the Control Panel, double click on the "Windows Firewall" icon, then select "OFF", the choose OK..
Although AVG and ZoneAlarm are designed to be running contstantly in the backgroun, Ad-Aware does not unless you have the "paid for" version which provides the "Ad-Watch" program..It's basically a "stand alone" spyware remover and doesn't provide "real time" protection unless the extra protection is purchased. One firewall, one antivirus and one "real time" spyware tool should be fine, but even then, it's important to monitor them to make sure conflicts aren't occurring.
There are a number of other spyware removal tools which can be used in much the same way...As long as you don't have them running in the background for "real time" protection, there should be no conflicts. Currently, I have one antivirus (McAfee), one Firewall (ZoneAlarm) and about 5 different spyware removers which are set to run as "on demand" scans only..Just when I ask them to..No conflicts here.
Hope this helps.
Grif