My wife did a hard shutdown on my computer and the next time I tried to start it up, it hung at the microsoft screen. I tried in safe mode and it loaded to \drivers\crcdisk.sys and hung there. I then tried to do a reinstall from a windows disk, same problem. I then changed to a new hard drive and it loaded and worked for about 3 days. The same problem happened again. i have now tried a clean install on 3 hard drives no luck. I checked my memory by removing all but 1 stick, dissembled everything and put in a new case, i was going to do that anyway, and checked all connections. could this be a motherboard or processor problem? hard ware? fyi, I was running vista 64 on nvidia mb, core 2 duo, 4 gig ram. Thanks