by machineman9 » Fri Apr 10, 2009 4:28 am
According to your specs, you have 4gb memory... So you should be looking at 64-bit operating sytems if anything.
I would choose Vista.
It is more modern, it will have longer lasting support, it caches better (yeah, that massive 'ramhog' is actually making the system work better) it has DX10 (though AFAIK this isn't properly supported in FSX anyway)
If you use a 32-bit operating system, I think that would leave you with about 2.5GB memory. As far as I am aware video memory is part of your total memory. Roughly a 3.5GB limit for *most* 32-bit operating systems, minus that 1GB for graphics memory leaves you with 2GB of system memory - So you have halved your amount.
64-bit Vista is probably the best option, then 32-bit Vista and finally XP because it is old and support for it is getting more limited.