The best thing would to be locally on the box and run Microsoft Baseline Security Analyzer V1.2.1 however if that is not really feasible then at least get temporary admin rights on these systems and scan them remotely with the tool. It will tell and log a boat load of stuff about the systems.

Microsoft Baseline Security Analyzer V1.2.1
http://www.microsoft.com/technet/security/tools/mbsahome.mspx

If you get on the box locally you could also run my Helpdesk script http://www.kixhelp.com/Downloads/MyComputerInfo.zip

You could also mail them the script and have them run it and mail it back to you if wanted.

You could also use a tool like LANGuard Scanner to get back a ton of info about the systems.

Hyena will gather a lot of info as well.
http://www.systemtools.com/