Some of the most popular PCs on the market today, equipped with fast and powerful dual- and quad-core CPUs, won’t be able to use the vaunted Windows XP Mode in Windows 7 (download). For your PC to run XP Mode in Windows 7, the CPU has to support Intel Virtualization Technology (Intel VT) or AMD Virtualization (AMD-V), and this support has to be enabled in the BIOS. You can check, if your exisiting system meets the requirement, follow this post.
The screenshots below incorporates data about Intel’s desktop & mobile CPU families from the Intel Processor Spec Finder. The good new, Intel Core i7 does support. Intel plans to update five of its processors to add VT support: the Core 2 Quad Q8300, Core 2 Duo E7400 and E7500, and Pentium E5300 and E5400 are slated to get the new designs.
Full Article: ED Bott