I hope someone can help. I'm running Win2k, P-4, 2.8 ghz. I built it myself. No problem. Six months later, it occasionally does not detect my DVD drive. I checked all wiring and all is fine. It won't shut down, unless I push the power button. It currently will lock up, after hitting the start button to shut down. I do the ctrl-alt-delete, and there's nothing to end. My screen eventually turns white. Then pops up the ending program which is Sony's Sonic software. Sometimes I go to shut down by pushing the power button and I get a message saying, you do not have that option. Something is using your DLA?