Most newer models will support virtualization. If they do, there is usually an option in the BIOS to enable the technology to be able to setup a Hyper-V or VM on the box.

I have a Dell Inspiron N5010, have installed Windows 2008 server (64-bit). at the time of adding Hyper V it asks to enable virtulization which i have already did, so i disabled it to add hyper v, now when am trying to run VM from hyper V it gives an error that need virtulization need to be enabled.

After enabling virtulization from BIOS a blue screen come up dumping memory and i cannot get to the login screen of Windows 2008 server. Any idea how to solve this problem?

Go back into the BIOS and enable the option. The warning box is a default window that pops up notifying the user virtualization is only supported on models that can handle it.