WebPageTest Private Instance ipfw driver causing unexpected shutdown

I have configured wpt server and wpt agent on single windows machine itself.
When I enter URL and test it I am getting “no test result analysis found” and
“ipfw driver not installed properly” while reinstalling the ipfw driver
the windows machine got shutdown unexpectedly.After which my network driver is not able to detect LAN connection in my pc
While installing ipfw driver have you experienced any unexpected shutdown and do have any idea for the cause of shutdown?.