get antivirus windows commandline
Solution 1:
If you are using an anti-virus package that properly reports into Windows' Security Centre you should be able to get its name via WMI.
This will return a list of all installed AV products from the local machine:
WMIC /Node:localhost /Namespace:\\root\SecurityCenter2 Path AntiVirusProduct Get displayName /Format:List
Note: I only tested this on Windows 7, so I'm not sure if it will work on XP as-is (should work on Vista+ though).