IÃ¢â‚¬â„¢m currently running Windows Vista Home Premium (upgrade from XP) 32 bit and planning to upgrade to Windows 7 64 bit. I have 2 drives C&D, OS is on C. I understand that I will need to do a clean install to go from 32 bit to 64 bit. My question is: Since I have a lot of programs on the Ã¢â‚¬Å“DÃ¢â‚¬Â drive will I have to reformat that drive also for 64 bit or will I be alright the way they are. My largest program is World of Warcraft which is huge. IÃ¢â‚¬â„¢m not so worried about reloading other programs which are much smaller. I'm not a noob but also not an expert. So please keep responses in somwhat laymans terms. Thank you in advance for the help.