I would not be attempting that from within Windows.
Use (full) XP CD, and run it from the Recovery Console.
I would be using /r instead of /f
Probably a good idea to have all your data backed up first.
PS Re-reading your post, it may not run from the Recovery Console either.
What I would do first, is get another hard drive, and clone the bad one into it.
Others may care to chip in here, in case your drive is dying, as every step you take may be adding to the damage.
Edited by RobCr, 08 June 2009 - 15:42.