Acceleration was not for me. Lots of problems with flashing textures / clouds / ctd when full screening that I didn't have with SP1, which worked fine.Question: How do I revert back to SP1? Does an uninstall of FSX Acceleration completely uninstall FSX or just take it back to SP1?Thanks

Uninstalling acceleration takes it back to SP1. I've done it a couple of times. No problems.

Thanks kd001. Its worth asking the stupid questions sometimes.