There can be a couple of issues there:
- HW issue:
Memory might have a defect
Graphics card has a defect
- SW issue (most frequent):
You have a virus. Get a bootable CD software like: http://www.hirensbootcd.org/download/ and boot your computer with this. Scan and remove the antivirus
Windows issue: boot the PC with the windows installation disk and go to REPAIR function.
In order to check if the issue is HW or SW, boot the PC and got o safe mode. If the PC halts also then, most likely you have a HW issue.
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