Just got a new system with Windows 7 64 bit, Thinking of moving over from FS9.1, I got what SPI does, what doew SPII do in english if you don't mind. Is it better to get the Accelerator Disc?Scooter

You don't need Acceleration to get SP2. Acceleration has a lot of nice aircraft and scenery, but SP2 is a free download for FSX users. I highly reccommend SP2, and Acceleration ain't bad either.SP2 fixes a number of bugs in FSX and is the compatibility standard for add-ons. You may get a boost in framerates, especially if you use DX10. There's more to it than that, but I think that's it in a nutshell. Jeff ShylukSenior Staff ReviewerAVSIM

Thanks just what I needed to hear.

I use SP1 and SP2 for FSX.