I have 2 HDs, the first with a primary active partition and a second logical partition, and the second disk with 1 primary partition.-I am actually using XP32 and want to install XP64, so I can select from each one to boot, and run MS Flight Simulator X without the OoM problems.- May I install it in my second disk in its unique partition ?I asume that I must install FSX and all my device drivers again in the new OS .-Does the new OS creates its own program files and document and setting folders, so it results in independent installs of FSX for each OS ?Thanks

If you install a new O.S. you must reinstall your applications and system software (drivers) as well. This includes FSX and all add-ons.Also keep in mind you can only install Windows on a primary partition.