You say two contradictory things...you say that you reformatted...and then later you say that you did a repair install. Am I misunderstanding what you typed?
What did you use to reformat/reinstall?
Recovery partition...MS XP CD...restore/recovery disks furnished by system maker, etc.?
Did you delete all previous existing partitions and install anew...or did you install over an existing XP install because you wanted to save files?
System manufacturer and model, please?