You may have to reinstall XP from scratch. Sorry, but the details and the story are yours to share and you didn't.
Maybe you are seeing a bootup menu with 2 copies of XP. If that's it, you can learn about BOOT.INI at google.com and what that file does.
i had to reload setup to get back in to my system,i now get a choice of setup or the loaded xp that i use,how can i get rid of setup,also when i choose the operating system ,disk check always starts how can i stop this