Naturally I am concerned I can't access the pc now and will loose documents.
I bypassed the initial repair and chose install and then selected repair from further on in the process.
If you have done a reinstall then you may well have already lost them unless they are on a separate partition or drive, do you have back ups?
after bios screen and windows logo it wants to re-enter set up again and start the whole process again.
Have you removed the XP CD from the drive? do so.