Freezes are, unfortunately, common problems. Some possible causes:
- Undersized power supply
- Bad power supply
- Erratic incoming power
- Bad RAM
- Improperly seated CPU heat-sink
- Bad fans causing overheating
- Blocked airflow causing overheating
- Bad hard drive controller (failed ECC logic)
- Corrupted software
Take a look at your situation, pick the most obvious issues, correct them. If this is a really new PC, return it for replacement (it's the easier way to deal with it).
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