A few months back I built my first PC and I am very happy with the results (see this thread). However, I have been having a few stability issues that I was hoping to fix. Every once in a while I will get a "windows did not start properly" with options for safe mode and a 30 second countdown. If I leave it like this it can potentially go into a cycle of not starting Windows. Also I have come into the room to find the screen completely black and the computer unresponsive. Finally almost everytime I try to play a large video (over 300 MB) Windows Explorer will give me a "Data Execution Prevention" message and crash, but the video will play just fine in the media player. My hardware: Antec Sonata II 450 Watt case & power Emprex 16x DVD dual layer burner Hitachi 250 GB 7200 RPM Serial ATA hard drive ATI All-in-Wonder X 600 Pro 265 DDR PCI Express LanPartyUT DFI nF4 Ultra-D mother board AMD Athlon 64 Processon 3000+ 939 Socket 1 GB Corsair matched memory pair Sorry for the length, but is there any way to address these issues? Thanks, Kyle P.S. I recall reading a review on newegg.com for my mother board that suggested flashing my BIOS. Could this help?