SAINT bootrec command is for Vista & Win 7.
fixboot and fixmbr for Xp.
I would probably be inclined to use the repair install option rather than the recovery console as manojgj suggested above.
If the OP is comfortable with the command line interface then the recovery console will be much quicker.
I have linked a guide below that has a step by step guide to repairing a non-booting Xp machine. I would start at step #2 and begin with "Last known good config...", then step #3 "System Restore" from Safe Mode:http://articles.techrepublic.com.com/5100-10878_11-6031733.html