A problem installing Office Enterprise 2007

I bought the Office Enterprise 2007 through the Microsoft Home Use Program
(from my employer). No problem with installing but everytime that I switched
on the computer and opened the Office program no matter which one of them, it
will run the set up, activating the software and so forth. It takes about
10-15 minutes to open it. I can use any of the programs such as Words, Excels
etc. after that without any problem but if I switched off the computer then I
would go through the same process again next time...

I have contacted the help desk and I was told to clean up the old Office
version, unstall and reinstall, clean the registry, etc but for no avail. The
last suggestions that I should log on to my computer with a new user and
install the Office then. I will try that but just in case there is any other
suggestions.

Thanks for your help.