According to this article, you won't need it for Virtual Box: Should you Enable Intel’s VT-x in Virtualbox? | Tombuntu
Have you checked to ensure that the VT-x support switch is turned off
in Virtual Box?
Were you able to upgrade to Professional without issue? If so, then the failed attempt to install Virtual PC is to be expected (due to the lack of VT-x support).
Anywho, the dump files blame the crashes on athrx.sys - a component of your wireless networking adapter.
I'd suggest downloading a fresh copy of the Wireless networking drivers
from the Sony support pages,
Then uninstall the currently installed version, then install the freshly downloaded version.
Also, Please update or remove these older drivers that were loaded at the time of the crash. Don't
use Windows Update or the Update drivers function of Device Manager. Please use the following instructions to locate the most current drivers:
How To Find Updated Drivers:
- search Google for the name of the driver
- compare the Google results with what's installed on your system to figure out which device/program it belongs to
- visit the web site of the manufacturer of the hardware/program to get the latest drivers (DON'T
use Windows Update or the Update driver function of Device Manager).
- if there are difficulties in locating them, post back with questions and someone will try and help you locate the appropriate program.
Here's the older drivers:
SFEP.sys Fri Aug 03 01:35:53 2007
mdmxsdk.sys Mon Jun 19 17:27:26 2006
regi.sys Mon Apr 16 11:19:10 2007
Post back if the BSOD's continue