Grisoft released an update to AVG Antivirus today that will make it work properly with Windows Vista. Grisoft does a good job of continually offering updates to fight the latest threats and correct any problems with compatibility that it finds. Current AVG users will get the updates automatically, but if you are new to AVG and Vista, then click on our link in the "Links and Resources" section at the top of any of our site pages.
A visitor asked about ZoneAlarm and Vista compatibility and after some research I found that many of the ZoneAlarm products are not fully ready for Vista yet. If you are a ZoneAlarm user, click on this link to reach ZoneAlarm's site and fill out their form that will give you notifications of updates as they become available.