Windows XP x64, VirtualBox 3.0.10, Karmic Koala blue screen

"This most likely is to do with Virtual Box itself and not related directly to running Ubuntu.

First thing to try is BlueScreenView which should be able to diagnose previous blue screens and tell you what the problem is.

If it is driver related, you would want to take a look for updates and if you cannot find one, try disabling in Virtualbox the device that will tie in with that driver if possible (For example, in a previous version, I discovered a bug with the Network card - whilst annoying, disabling the NIC stopped blue screens).

If it is unknown, you may want to do some general diagnosing starting with a Memory checker."