I was not quite sure where to post this. I am running a AMD Phenom II X2 545 CPU 3.0Ghz on a Gigabyte MB. I have 4gig DDR3 ram & a ATI HD4850 512mg video with Win XP 32bit. I run FS9 quite well. I am wanting to go to FSX eventually but my FS9 setup is very good. The question is will installing Win7 64bit be any improvement for FSX & more importantly will it hurt my FS9? I already run my FS9.exe large address aware. My understaanding is some of my older add-ons might have a problem with the 64bit OS. It seems like a lot of work. Any thoughts on the subject would be appretiated.