I am having difficulty getting my computer to boot. I have Windows XP installed, and haven't applied any patches, installed programs,etc. recently. System was working fine last night, but this morning it will not boot up. The black screen with the white bars along the bottom comes up and then hangs about 7 or 8 bars into the loading. I cannot boot into safe mode, using last known good configuration did not work, and a repair install did not help. Any ideas that I can try before I do a clean install? TIA