Motherboard: Asus A8N-SLI Deluxe Video: NVIDIA Geforce 9800 GT w/512MB RAM: Kingston HyperX PC3200 I loaded 64-bit Windows 7 RC with only 2GB of RAM. I recently bought an additional 2 GB of RAM and when I installed it, Windows 7 starts to boot then see a quick blue screen and reboots. 1. Removed the RAM and Windows 7 boots up fine. 2 Took the old RAM out and install the 2 new RAM sticks (slot 1 and 3), again boots fine. 3. Moved the new RAM to slot 2 and 4, boots up fine. 4. Put new RAM in slot 1 and 2 and old RAM in slot 3 and 4, Crash 5. Removed RAM from slot 4, boots up fine. 6. Moved RAM from slot 2 to slot 4, boots up fine. 7. Typed BCDEdit /set PAE forceenable, shutdown and installed last RAM, windows crashes. So no matter what I do, Windows 7 will run fine with 3 GB, but crash when I install 4 GB. My motherboard supports 4 GB of RAM, just seems the Windows 7 I have does not. In the process of trying to reinstall Windows 7 with the 4 GB installed to see maybe that will resolve it. Any idea what could try before reinstalling?