I have Vista x64 home premium installed, which was running pretty good without any major glitches other than driver issues with some peripherals. When I try to install sp1 via windows update, all looks good until the final reboot when the computer boots in to the bios and then the screen goes black other than the mouse pointer which I can see and move. No activity is evident from the hd light. I have also tried the standalone install with exactly the same result !!!!! All other security updates etc ... seem to have installed without a problem. I am stumped, any ideas ?