I've tried every switch out that I could find on this site as well as the "official" unnatended website. I've downloaded the latest version and extracted everything until it turned out to be an msi file. Can someone help? Here is the official website:

http://www.winxp-manager.com/

Thank you in advance

doesn't /qn work on the msi file then?

You have to install Microsoft .NET Framework 1.1 before you can install WinXP Manager.