Hardware Questions - FSX

From FlightSim

• I have an Intel dual core processor and a GTX 8800. I run Vista 32 bit with 2Gb RAM. I have got SP1 installed. Would I get a performance increase if I upgraded to Vista 64 bit?
• Can you give me advice on getting the Nvidia 8600GT w/512 DDR2, PCI-E for use with FSX?
• Can I get FSX to run at a lower resolution than 1024 x 768?
• How can I play FSX on my laptop?
• When doing a startup in fullscreen modus with FSX on my Matrox Triplehead2go, I get an annoying "blackout", after a couple of minutes, and this only occurs in fullscreenmode, and not in windowed mode.