Hello cmpbellsjc I wanted to tell you I tried to edit the UserVa at command prompt. I put in 2560 and FSX worked...I was geting those oom messages, so I am obviously pleased they are gone now! I have Ground Environment ( Gex North America), Active Sky X, Ultimate Traffic and many, many addons. My question is can I leave the 2560 at the (set IncreaseUserVA), or do I need to start the back off in increments of 64? I took very long flights to verfy if it worked...everything was smooth (and I got some pretty high settings in FSX). Thanks for your post...very good and successful advice, Goose 5760By the way, I just signed up for the forum today so I hope I put this at the right place.