I had an issue with this last week during a BPM 11g workshop in the Netherlands.
We provided a 64 bit linux image running BPM11g but we couldn't get this to start on WinXP. We got the follow error -
We ensured that the BIOS virtualisation settings were ok.
Then we read the documentation -
always a good thing to do...
As a result we made the following changes -
1. Checked the boxes on the System --> acceleration tab
2. Changed the OS Type from Oracle to Oracle 64 bit.