My boyfriend just got a new computer with Windows 7. I am still (sadly) running vista and I would really like to have 7. Is it possible for me to wipe my computer clean (after a back up, of course) and use his discs to get the Windows 7 OS? or am I going to run into registration issues?

I had vista on my laptop, upgraded to windows 7. It’s working good, but I would like to reformat my computer. The only problem is my windows 7 discs are for upgrading. I’m afraid if i wipe my disc clean, I won’t be able to use the upgrade discs on my fresh drive. Is there a way?