Can you boot into Safe Mode?
If so, I think you can do a System Restore in Safe Mode back to an earlier date prior to the changes you made that might get you back to where you need to be.
This is a Restore, not a Recovery. So I'm not sure it will necessarily fix your issue. The good part is you don't lose data.
What about data files, are they backed up or would you be okay reinstalling XP and losing data?
If it is an HP machine, it may have a "Recovery Console" that also might be accessible in Safe Mode. Had HP machines that had that, but never used it, but it is supposed to allow you to return to the original configuration of XP as installed when you bought the machine.
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