The tomshardware hit from https://www.google.com/search?q="kmode+exception+not+handled"
This problem may occur due to any faulty hardware device or its incompatible driver, any recently installed software program, corrupt or conflicting system services, etc. In most cases, this issue can be resolved by updating the drivers of a newly installed hardware device that is causing the problem
See the google results for more.
Think about what recently changed on or in your machine.
My computer shuts down frequently due to the subject error