Problem with disabled VT
Some recent ThinkPad models ship with Intel CPUs that implement the Intel VT extensions for hardware-supported virtualization, but the capability is disabled by the BIOS. There is no known solution. See this LKML thread.
By default, on thinkPad, VT extensions are disabled. Before to try a firmware update, you can check this help : http://amiduos.com/support/knowledge-base/article/enabling-virtualization-in-lenovo-systems
BIOS Update for ThinkPad Z61e, Z61m, Z61p, Z61t
Lenovo solved the problem with a BIOS update on June 6, 2007. Flashing the new BIOS adds a configuration option to the BIOS to allow or disallow the use of VT.