You could run the Windows 7 Upgrade Advisor on your XP machine. I know you're not going to upgrade that PC, but it would still tell you if the software is Win7 compatible. If you have your Trust wireless dongle connected when running the check then you'll also get a result for that.
http://windows.microsoft.com/upgradeadvisor
If any of the software uses online licence activation then you may have to phone the respective supplier and persuade them that you really do have the software installed on only one PC.
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There is also this site if you want to do things more manually:
http://www.microsoft.com/windows/com...b/default.aspx