Possible Duplicate:
When reinstalling Windows 7, does the language, version, architecture (64-bit or 32-bit) or source (OEM, retail, or MSDN) matter?
I got a copy of Windows 7 Pro from my school just in time when I needed to make a format but yesterday I went to a Windows 7 meeting and they gave everyone a free copy of Windows 7 ultimate.
So I want to upgrade since this version they gave me is a Oem version I am guessing so I should be allowed to do commerial use stuff with it where as my school copy I can't.
I still want to keep my old copy of Windows 7 incase I want to install on another computer but where I downloaded it from(msndaa) it says single user.
So I think I probably have to use deactivate it or something?
Also I guessing that I can use the anytime upgrade and type in my new key?
Another thing I am wondering is what is the difference between OEM and Retail? I got a copy of office 2007 what is also OEM from school and after a few activations it told me I reached my limit of activations.
I had to like phone this activation number and after phoning it a couple times and trying random numbers of how many times it was activated it finally let me activate it. I am just worried that the next time I install it won't let me activate it at all.