Microsoft released KB977206 which allows customers to use Windows Virtual PC and Windows XP Mode on non-HAV (Hardware-Assisted Virtualization) machines. XP Mode continues to use hardware virtualization such as Intel Virtualization Technology (Intel VT) or AMD-V chipset when available but it no longer requires them. “A number of customers & partners have been asking to support a wider range of PC’s including those without HAV capability and we’ve delivered this software patch to address their needs. We believe that this change simplifies customer experience and makes this benefit accessible to many more PCs. KB article describes various scenarios under which software update must be installed. Ensure that Windows Virtual PC is installed before applying this fix.” posted Microsoft. Note: Download and run HAV Detection Tool to check the HAV capability of machine. Go through user guide for detailed description of the result. Finally, this update contains the fix for the power state issue seen (with WVPC installed) on Intel Clarkdale/Arrandale processor (KB977632) and it’s recommended you apply this update on that specific hardware.