Hi All, Here's the issue: after upgrading from 2.5gb of RAM to 4GB, Windows 7 (x86) bombs: BSOD style. I make it to the "starting Windows" screen, minus the cool animation. DRIVER_IRQL_NOT_LESS_NOT_EQUAL STOP 0X000000D1 (0XFFFFFFFE, 0X000000FF, 0X00000001) The hardware: DDR2 PC2-5300 2gb SODIMMs. I have 3 sets of 2GB (I purchased the 3rd SODIMM after I initially suspected bad memory) and an old 512MB. However the RAM works perfectly fine with Live CDs. So the hardware is okay. So how do I get Windows 7 to accept the RAM upgrade? paean PS. My version of W7 is an upgrade from Vista Home Premium.