Just wondering if its possible. Basically I bought an OEM copy of win 7 32bit. It was all that was available at the time. My brother and my dad both have 64 bit versions, and I'm wondering if I use their DVD to install 64 bit can I use my 32 bit key to activate it. My Dad's win 7 64 bit is also OEM, and my brothers is a full retail version with both 32 and 64 bit included. Any insight would be greatly apprieciated before I take the leap, and find out that I can only install my 32 bit again. Thanks.