I had a similar problem (see reboot thread on page 2 ).
Re-instal graphics card, I had to call Nvidia for help. Get the latest driver.
My problem was caused by using a GWX 1.02 career.
For safety I removed all SHIII files and GWX. Then downloaded and installed everything.
When you move up to GWX 1.03. You need to start new career.
Old careers will cause game to crash into reboot and mess up your driver.
Best of Luck.
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