Possible Duplicate:
When reinstalling Windows 7, does the language, version, architecture (64-bit or 32-bit) or source (OEM, retail, or MSDN) matter?
My new computer shipped with a 64 bit version of Windows 7 but I want to install a 32 bit version of it (I have the 64 bit DVD). I also have a 32bit DVD which I bought a copy of for my laptop. Can I install the 32 bit Windows on my new computer and use the 64bit serial to activate it or would I have to purchase a new 32 bit Windows OS?