Thanks for reply.
Lately I have realised that this error message is because one of the following reasons.
- VT is not enabled in BIOS
- CPU is not capable of VT
There is a simple Microsoft tool to check CPU VT capability and BIOS configuration. details about the tool is documented here . http://virtualcloudzz.blogspot.com.au/2013/06/steps-to-check-processor-cpu-vt.html
I had similar issue while implementing VMware view local mode, I have seen similar error message on client PC after View desktop checkout and power on. More details here