Need to create a report in CMS 7.1 to list all Windows XP systems

I would assume this should be a fairly simple process however seems to be somewhat complicated. I want to create a report in Altiris 7.1 that just lists all computers with Windows XP installed. Shouldn't there be a method where you can create a report and just select from a list specific criteria or do you need to create some complicated SQL statement to do this task? Unforatlu8natly I don't have any real experience creating SQL statements. I would assume that this task should be able to be created with just a few mouse clicks.