Why don't you scan the drive for viruses while its in the Vista computer. If it finds anything and deletes it, then put it back in original computer and see if it boots up correctly. Do you have the XP install cd? If so, then copy any data you need to a backup or another system and then boot to the cd, delete existing partition, then repartition, then it will format and reinstall windows. If you can get it boot up correctly after doing the virus scan then you should run Malwarebytes Antimalware program and check it for malware.
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