Windows 7
XP Mode-Final
Microsoft has released the final version of Windows XP Mode. Windows XP Mode is a virtual Windows XP environment which can only be run under Windows 7 Professional, Ultimate or Enterprise editions, allowing older applications designed for XP to be used in Windows 7 without any compatibility issues.
---
Conclusion: Windows i think maybe too smart to put other versions all in one OS through Virtual Machines, that's why its more faster than XP/Vista.
Take Note: Using VMWare makes the PC slower than usual.
Pretty Smart huh
