Event ID: 1001, Source: Bugcheck, Please help.

After upgrading to Windows 7, I keep getting unexpected reboots from the following:

Event ID: 1001,
Source: Bugcheck: 0x0000009f (0x0000000000000003, 0xfffffa80043aa060, 0xfffff80000b9c518, 0xfffffa800511f580).

What is the problem? And how can I fix it? Thank you.
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More about event 1001 source bugcheck help
  1. From the bug check codes page at Microsoft:

    "Bug Check 0x9F: DRIVER_POWER_STATE_FAILURE

    The DRIVER_POWER_STATE_FAILURE bug check has a value of 0x0000009F. This bug check indicates that the driver is in an inconsistent or invalid power state."

    Update the major drivers in your system (video, sound and network, chipset). This bug check is generally caused by the network and chipset drivers, but update all 4 mentioned above to be sure.
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