I did some work on a friends PC this last weekend and I wanted to share exactly what it was doing and ask what it could have been. I've already fixed the problem by reinstalling Win XP but I believe I could have been able to keep the original settings if I knew what the exact problem was.
Ok... The PC wouldn't boot up, it would freeze before it got the welcome screen. So I tryed to go into Safe Mode to run some diagnostics but after booting, the PC would go back to the screen in which it was freezing on.
So I tryed Recovery Console from the Win XP boot disk and ran ScanDisk thinking there was a corrupt boot sector (or something of that sort). Scan disk would get through the 2nd step but at 78% of the scan it would restart at 50%.
I got tired of it and just reinstalled XP and upgraded to SP2 since my friend cannot avoid spyware!
But if I ever encounter this problem again is there other diagnostic processes I could go through before reinstalling.... and for those who have seen this problem... what could it have been???