Virtual PC and hardware-assisted virtualization (VT-x) problem

In the BIOS is VT actually turned on? Many motherboards come with this disabled by default.

In some BIOSs you need to enable VT in more than one place. Look in both the Chipset section as well as the CPU section for virtualization options.

"The error message you're getting from Virtualbox indicates that it cannot get exclusive access to VT and will fail to start. This usually happens if there is an application running that is making use of the VT when virtualBox is run.

I appreciate this is not specific to MS Virtual PC but it may be a clue..."

I enabled it my Vaio, it was usb-boot-disk based hack. Once in DOS-mode you get the cmos as a file using SYMCMOS.EXE, change the correct register to [0001] and flash the cmos with the modified file. But after rebooting, Virtual PC's section on Virtualization and MS' HAVtest say I don't have VT-x... so strange.