First, thanks for the quick reply.
Yes, I have a corrupted file on my Winxp which does not allow me to get past the welcome page (I'm asked for a password even to login to Administrator). Tried to do a "repair" from the installation disk and it doesn't work, get same situation where I'm asked for a password. I've read that this is due to a corrupted file in Sys32 (cannot remember which one now). So thought I would try and transfer all my important files from my C drive to DVD and then do a clean install of Windows.
Knoppix (installed on a thumb drive) mounts all my drives on my computer and I can copy between them, but cannot get a good burn to a DVD (even though the blank dvd is recognized in Knoppix. Today, I thought I had it as the DVD completed, but ejected automatically (I assumed after the burn completed) and I got this crazy message that told me to manually eject the disc, even though it had ejected itself.
On the bottom of the DVD I could tell the DVD has burned to end (and I also had followed the burn process), but I could not get the burner nor a DVD Rom drive to recognize it. I did get a file log of the total progress of the burn if that would be helpful in figuring out what went wrong.
That's why I thought I might try another Linux system.