Last week during the night I just happened to walk by my office door and noticed that my PC was repeatedly re-booting. I immediately shut down the system. The next morning I rebooted my system and the same re-booting process stated again. The POST process was happening so fast I didn't even have a chance to see what the error message was on the Blue Screen. I wasn't even able to boot up in Safe Mode. So, I shut down my system and waited about 30- minutes. Re-booting, a message appeared stating that the dll file hal.dll was corrupt or missing. Later, however, I detected that the hard drive was failing. I attempted to clone the drive using Acronis True Image but wasn't able to access the drive. Now I have learned the importance of "frequently" backing up one's data. I also tried to correct the problem using Hiren's Boot CD. Yet when I inserted the CD into my CD-drive, nothing happened. There was a notice at the end of the POST: "Boot from CD." Yet when I pressed the Enter key, Windows started instead of the Hiren's Boot CD. This CD has been used in other systems, , , and worked. And I know for a fact that the boot sequence in my system is set for the CD drive. So why am I experiencing problems with allegedly independent boot disk will not boot as it should?