Hi Peter.

64 bits is the way of the future. I have Windows 7 Professional 64bit with 8GB of RAM and I'm planning on getting another 8GB of RAM in the not too distant future. A 32bit system has a maximum capability of using 4GB of RAM and no more. I have no problems at all running FSX on my computer.

I say go with a 64bit OS because it has plenty of room for expansion. 2³²=4GB, 2⁶⁴=17.2billion GB! That number makes my mind boggle!

I have never suffered an "Out Of Memory" issue. Not even before I moved to a 64bit system. Something else might be causing that problem. Try turning some of the sliders down a bit (until it stops happening).

Mark

NOTE: Windows 7 Profession, Enterprise and Ultimate 64bit is limited to 192GB of RAM.
Windows Home Premium 64bit is limited to 16Gb of RAM.
Just some food for thought. More info here: http://msdn.microsoft.com/en-us/library/aa366778%28VS.85%29.aspx