haha. just look in the registry, stuff is typically in HKLM\software\vendor. another probably overkill thing you could do is install your cab, dump your registry, uninstall dump it again and run windiff on the files. some stuff will change but it should make it easier to see what changed. I recommend ceregeditor for the job
OR
send me the cab or just post it here and I or someone else will tell you exactly what regs it changed