On my main PC, I now get an error message at boot-up which reads something to the effect of Sorry for the inconvienence but windows could not start properly due to a recent hardware or software change. Then I get a list of start-up options including safe mode, safe mode with drivers, last known good configuration, and normal mode. I have tried all of them and sometimes windows will start, but most of the time I get the same error message. I haven't changed any system configurations or added or removed any software recently. I finally got booted up and ran both Norton antivirus and ad-aware and both came up empty handed. Could this be a sign of my HD failing?