If you use many programs that were written back in the Windows XP days that are not very compatible with Windows 7 a new update may make you very happy. The new Windows 7 update cuts the hardware virtualization requirement for XP Mode.
Users of Windows 7 Pro, Ultimate, or Enterprise should now be able to run XP mode sans hardware virtualization. This means that some of the older Intel CPUs that lack virtualization capability will be able to use XP mode.
XP mode will still use virtualization features when your CPU supports it, but removing the requirement makes the feature available to more users. The new XP Mode update can be downloaded now from Microsoft.