I have a 2012 MBP with 8GB of Ram. I also have Parallels 8 installed - I got it for free when I bought my MBP from B&H. Anyway, now I need to install Windows so I can run Microsoft Access, and i need to decide which version I should buy, Windows 7 or Windows 8, and if I should get the OEM version or the regular retail version. Also, 64 bit or 32 bit. Any advice from people who've done this recently? I need to make the purchase in a few days. If it matters, I'll be installing Microsoft Office 2010.