First of all, thank you for you suggestion Morten, I think your solution will work: my workstation will be upgraded from Windows XP (with full admin rights) to Windows 7 Enterprise as power user.
At home I don't have windows powered computers, so I have no idea how I will upgrade later on, but I have a lot of time to think about it.
Is it possible to ask the development team for a zipped version of C::B instead of the user installer?