I just realized that the update is for a different system, so that fix wouldn't work for you.
Do you have a Windows XP install CD? If you do, start up the
Recovery Console and execute the following command:
This will do a thorough scan of your drive, correcting any problems along the way. After you have finished doing that, restart your machine and see if it loads properly.
If you don't have access to a Windows setup disk, use the instructions on
this page to optain Windows boot disks. One of the options as you work with these disks is to load the Recovery Console. After you load the console, use the instructions above to run the disk scan.