Windows VirtualBox image started in blue screen

I am using VirtualBox in Ubuntu environment. A colleague of mine downloaded a bunch of VM images for Windows so that we could test our web application in IE6, IE7 and IE8.

However, somebody's machine like mine one in the company have the weird problem. The problem is when I starts up the Windows images, no matter it's IE6, IE7 or IE8, blue screen will appear and keep restarting the virtual image.

After several rounds of searching solution from the net, the problem is due to Windows trying to load up VirtualPC processor, not VirtualBox process, which is never gonna work. So to solve this

1. start the windows up in safe mode (by pressing F8)
2. open command prompt, run the following command:
   "sc config processor start= disabled"
   *note: there is a space between '=' and 'disabled'
3. restart

It should be working fine after restart.