I've been having a problem lately of getting kicked back to the desktop when I start up a game, either OpenGL or Direct3D. I assumed it was something with my computer since I hadn't reformatted and reinstalled everything in quite some time, so I did an FFR, got everything back up and running, and low and behold, Battlefiled 1942, Diablo II, and Asheron's Call 2 all kick me back to the desktop, and when I try and switch back to them, it auto-exts and switches back again. I had been putting some fairly high resolutions and graphics options in Asheron's Call 2, but Diablo II requires almost no graphics options. I did a search on Google, very fed up that I couldn't play any games, and as I read through an article on Intel's support site, it's then that I realized that the general consensus seems to be that 64 MB is plenty in the AGP Aperture in BIOS. I had changed it from 128 down to 64 awhile back, and that's when my problems started in earnest. Games that don't have enough room to store textures, whether it's on an Intel adapter like described in the tech document I read, or any other adapter, will automatically switch back to the desktop because they can't load the game. I kicked the aperture size up to 128 in my BIOS, lo and behold, everything runs again. I have 768 MB of RAM and a 128 MB GeForce4 Ti4400, and 64 MB wasn't enough for FSAA games with the highest detail options. I'd recommend setting your AGP APpure to at least 128 if you use higher detail levels.