Help needed to newbie

Hi Lads & Lasses.
I'm new to Simviation, and need help.
I was here a few years back and have rejoined as I want to start flying again.
I have loaded FSX (Deluxe) with Acceleration pack and some other add-ons, before I used Windows XP Pro and had no problems, I am now using Window 7 Ultimate and i can play for less that half hour then my computer just turns off, I have read lots of forum about this and some say that W7 64 bit is to blame, so I'm thinking of re-installing FSX and some add-ons with a new OS
Should i use windows 7 32bit or go back to Windows XP?
I only want an OS and FSX on the PC, as I have purchased a CH Product yoke and Saitek Pedels and have the Saitek Radio Stack and Multi panel, so really want to get the best out of my fligh sim.
My PC spc for this is
AMD athlon 64x2 dual core 2.1ghz CPU
ATI Radeon 4670 1 Gig DDR3Graphics Card
4 gig DDR2 Memory and a 300 gig SATA HD.
any help please.
Thanks in Advance
I'm new to Simviation, and need help.
I was here a few years back and have rejoined as I want to start flying again.
I have loaded FSX (Deluxe) with Acceleration pack and some other add-ons, before I used Windows XP Pro and had no problems, I am now using Window 7 Ultimate and i can play for less that half hour then my computer just turns off, I have read lots of forum about this and some say that W7 64 bit is to blame, so I'm thinking of re-installing FSX and some add-ons with a new OS
Should i use windows 7 32bit or go back to Windows XP?
I only want an OS and FSX on the PC, as I have purchased a CH Product yoke and Saitek Pedels and have the Saitek Radio Stack and Multi panel, so really want to get the best out of my fligh sim.
My PC spc for this is
AMD athlon 64x2 dual core 2.1ghz CPU
ATI Radeon 4670 1 Gig DDR3Graphics Card
4 gig DDR2 Memory and a 300 gig SATA HD.
any help please.
Thanks in Advance