Uma explicação simples
http://www.microsoft.com/windows/virtual-pc/support/configure-bios.aspx
Verificando se seu processador AMD da suporte a virtualização por habrdware
AMD Virtualization Compatibility Check Utility
Verificando se seu processador Intel da suporte a virtualização por hardware
Intel Processor Identification Utility
Sample instructions for your PC
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Depress the F12 key when boot menu text appears at startup
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Select BIOS setup and depress the Enter key
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Using the mouse, expand the Virtualization Support menu item by clicking on the plus to the left of Virtualization Support and select Virtualization
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Check the Enable Intel Virtualization Technology checkbox
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Click Apply
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Click Exit
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Fully shut down (power off), wait a few seconds, and restart your computer
HP systems
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Depress Esc key when prompted at startup
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Depress the F10 key to Configure BIOS
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Scroll to System Configuration using the arrow keys
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Select Virtualization Technology and depress the Enter key
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Select Enabled and depress the Enter key
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Depress the F10 key to save and exit
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Select Yes and depress the Enter key
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Fully shut down (power off), wait a few seconds, and restart your computer
Lenovo ThinkPad systems
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Depress the blue ThinkVantage key when prompted at startup
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Depress the F1 key to enter the BIOS setup utility
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Using the arrow keys, scroll to Config and depress the Enter key
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Scroll to CPU and depress the Enter key
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Scroll to Intel ® Virtualization Technology and depress the Enter key
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Select Enabled and depress the Enter key
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Depress Enter key to continue
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Depress F10 key to save and exit
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Select Yes and depress the Enter key
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Fully shut down (power off), wait a few seconds, and restart your computer