When I installed 8.1 my hardware would only support 32 bit. Since then I've put in a new motherboard and processor and doubled the memory (no change to discs). I'd like to convert to 64 bit. The 64 bit disc won't run at all (says my 'puter doesn't support 64 but I think this has to do with setting stored on the hard drive.) The 32 bit disc doesn't offer an "upgrade" option when I run it. What's the secret handshake to make this work? Thanks for your help!