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Not all AMD Processors Support 'XP Mode' in Windows 7
A new feature of Microsoft's Windows 7 operating system that created a stir is its "XP mode" feature, where the operating system provides the user with a sandbox Windows XP desktop environment, complete with all its features, and application support. What makes the feature even more interesting that documents, settings, and XP-affine applications installed in the environment could be seamlessly integrated with the host Windows 7 environment.

It turns out now that the feature explicitly requires hardware-level virtualization support. AMD and Intel, both have their proprietary virtualization features, although the two chose to make it available only to a few CPU models. Generally, entry-level desktop/mobile CPUs don't carry the feature. For consumer client desktop variants of Windows 7, the "XP mode" feature would require AMD-V feature by the processor. Currently all processors by AMD support this, except those from the Sempron series, according to an AMD spokesperson. For enterprise variants of the OS, Microsoft Enterprise Desktop Virtualization (MED-V) MED-V 2.0 builds on top of Windows Virtual PC and provides centralized management of Windows XP Mode. MED-V is a virtualization management platform. It will be made available within 90 days of the commercial availability of Windows 7.

Source: CNET

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Virtualization support required by cpu.