Vista - Windows auto shut down by itself,error code Bccode :9f

Hi all,my windows reboots by itself when you leave it for a while,and when on restarting i received a pop up saying that windows has recovered from an unexpected error. I saved the minidump file and all information needed for debugging,any help will be really appreciate it,the attachment includes the error,thanks.

The way you posed the question and included info is great! Have some rep

The direct cause of your crash is this driver:

Image path: \SystemRoot\system32\DRIVERS\NETw5v32.sys
Image name: NETw5v32.sys
Timestamp: Tue Nov 18 02:40:18 2008 (49219062)

It seems unable to handle a power state transition and it's behaving as if the machine is in power state "X" when it's really in state "Y". It's possible that the underlying hardware (the wireless NIC in your Lenovo laptop?) is the real culprit, and its driver is merely the conduit for bad news, but it's more likely that the driver is buggy. Suggestions:

- Try updating that driver to the latest version, then test what happens when you leave the laptop to sit idle again (thus triggering power state transitions).

- If an update doesn't help, try removing the driver outright and testing once more. That's not a solution but at least you'll know for sure whether it happens with the driver gone.

- If all else fails, write a nastygram to Lenovo and then deactivate all power management (so the laptop sits in full power mode all the time) while waiting for them to fix their bug. Obviously, that would have negative consequences as far as your battery life is concerned.