How can I repair WINDOWS Xp without reinstalling the entire operating system?????!!!!

How can I repair WINDOWS Xp without reinstalling the entire operating system?????!!!! Okay, i was doing some computer cleaning, deleting junk files, uninstalling, etc… then when i restarted my computer, my operating system, windows xp media center, the whole interface was lost. in other words, i cant see my desktop start menu, everything was reseted...

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