Random restarts can be caused by a number of things -
1. Memory. The most popular software for testing RAM is memtest86, but I've known some cases where memtest86 detects no problem with RAM but it still causes problems. If you can borrow a known good RAM stick, try substituting your RAM.
5. Inadequate power supply.
2. Incorrect BIOS settings. Try clearing the CMOS and then reinstall the OS.
3. HDD bad sectors. Have you done a surface scan ?
4. Virus.
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