This really freaked me out!!! I was innocently playing Solitaire on my favorite game site, when all of a sudden the screen went black. At first I thought it was a power outtage, since that does happen once in a great while in my neighborhood. But then, the Big E appeared, and I could see that my computer was rebooting all of a sudden, for no reason at all. It has never just quit and restarted like that! It is 2 years and 1 month old. I have 512 MB of RAM. After the Big E appeared, then the screen was black with white letters, as if the computer was in DOS. (I guess it was.) It kept saying Disk Boot Failure when I hit return. So, I shut off the power strip, since I couldn't shut it off the normal way. I waited about 5 minutes, turned it back on, and then chkdsk started running automatically. I wondered how long this was going to take, so I walked away and did some other things for about 10 minutes. I came back, and everything looked normal - it had rebooted successfully.
I'm freaked out about why it would suddenly try to reboot, when I wasn't receiving any Windows Updates or doing anything at all out of the ordinary. I had 3-4 windows open. My system wasn't hung (like it used to do in the past) before I discovered Antispyware scans and TuneUp. Also, I have been using TuneUp successfully for the last 6 weeks, and I really like it! I have cleaned up the hard drive a few times and cleaned up the registry also. I just ran an Antivirus check (my Norton) yesterday and found nothing. I ran a Trend spyware check Saturday, and found about 11 of the usual ad cookies and got rid of them. I ran AdAdware just an hour before this weird crash happened. Nothing worrisome was found by AdAware.
What else can I do to ensure this doesn't happen again and find out why this happened?