So, I have a Windows 7 Ultimate x64 installation on my desktop. It is a fairly new computer, and I know that hardware is not the problem. I've noticed that when I leave my computer on, whether for a few hours or overnight, when I next see it, it's powered off. PLEASE do not ask me to look at my power settings. This is not a case of my computer going into sleep mode or hibernation. It is fully off. When I power it back on, after going through the "Windows was not shut down properly" boot screen and logging in, there is a screen saying that an unexpected error occurred. I didn't think to copy and paste the info here, but I will the next time I see it. It really doesn't have any useful information, other than it was a bluescreen event. The thing is, I'm never at the computer when it happens, so I haven't seen the bsod. Does anyone know what could be making it crash when left on for a while? I have 4gb of ram, and before this, everything was working fine. On a side note, interestingly, I had this same problem on another computer that had a x32 installation of Win 7 Ultimate. This makes me sure that it's not a hardware issue. Thanks!