Download the BIOS version 1.09 dated 26 Sep 2011 here http://www.acer.com.my/ac/en/MY/content/drivers.

AMD A6 does support AMD-V hardware virtualization. Thank to my friend Rob T for the useful feedback. Somehow you cannot disable or enable it from through BIOS.
Resource:
Acer Aspire 5560G AMD A6 does not support hardware virtualization
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Ming Man is a senior manager for a development company. With 20 years of experience in the IT field, he has developed system using Clipper, COBOL, VB5, VB6, VB.NET, Java and C #. He is familiar with the N-Tier design of business application and is also an expert with database experience in MS SQL, Oracle and AS 400.
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Can you explain more? I updated to 1.09, but I do not see AMD-V or VT-x in the BIOS. CPU-Z still reports that I do not have VT-x.
What is the OS or VM software that you are using?
The latest preview of Windows 8. I have tried Hyper-V and Virtualbox.