WINDOWS XP - ERROR LOADING OPERATING SYSTEM OR ERROR READING DISK?

My mum brought a new desktop a month ago from a computer shop, but when it turned on it said something about it wasn't an official version of xp. It has been working fine nether-the-less. She was on it this morning and shut it down correctly. An hour later she booted it back up and it got to the logo screen "intel"... show more My mum brought a new desktop a month ago from a computer shop, but when it turned on it said something about it wasn't an official version of xp. It has been working fine nether-the-less. She was on it this morning and shut it down correctly. An hour later she booted it back up and it got to the logo screen "intel" where we could load settings and then went to a black screen, within seconds a message appeared saying "error reading disk - press ctrl+alt+del to restart" so we did.

We went onto settings and clicked load factory settings and rebooted it only to get the same problem with a new code. "error loading operating system"

Any help?
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