I have a 32 bit OEM (system builder) Windows 7 Ultimate install DVD with a product key that has not been used. But I also have the install disc for my PC where I installed the 64 bit version of Windows 7 Ultimate. Is it possible that I could install the 64 bit version using my 64 bit install DVD using the product key that came with the 32 bit version? If the 32 bit version were an updated SP1 version would that make a difference? Where the 64 bit install DVD was the original release?