Do you ever get a stop error message? Or does Windows say anything about it when you restart?
Has this always happened, or did it start suddenly?
Could there be other programs causing a conflict? Try closing everything you don't need (through the Task Manager processes tab).
A cooling issue seems possible - can you use a program to monitor the CPU temperature leading up to the freeze?
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With our extreme gelatinous apology,
We beg to inform your Imperial Majesty,
Unto whom be dominion and power and glory,
There still remains that strange precipitate
Which has the quality to resist
Our oldest and most trusted catalyst.
It is a substance we cannot cremate
By temperatures known to our Laboratory.
~ E.J. Pratt
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