Spoke to Intel support this morning and they told me to run a BIOS recovery even though it is already the latest rev. I did this from CD and now I have VT options back in the Security section of the BIOS!!!
It took two attempts to recover the BIOS. First attempt hung when it got to "Flashing processor updates". Intel told me to do it again with a new image and the second time it worked.
Please I need your help, I have an Intel DP35DP, it was working (virtualization) with a Q6600 processor, after I upgrade to a Q9550 processor my bios stop showing the virtualization option and I can't run Virtual XP mode in Windows 7. What setps you made?
Sorry for may bad english and thanks in advanced!