I installed an Intel E8200 Core2Duo CPU on the dp35dp mainboard and is works fine with Intel VT.
Now I replaced the CPu with an E8500 an the VT setting in The Bios settings is no longer available.
By downgrading BIOS to Version 484 is works again.
Is this a bug that will be fixed or musst the BIOS Version Stay on 484?
(OS is Windows Server 2008 x64 with Hyper-V)
Its clear that is a BIOS problem.
Best and quickest solution in my opinion is to contact Intel support directly.
There's a section for Desktop Boards and a Live chat function (also a submit e-mail link).