Most IT departments for corporations are understaffed and run on a budget. They do not have time to 1) explain to workers how to use virtualization and 2) they are not going to deal with implementing the security protocols that most companies run in a virtual environment. You are asking IT departments everywhere to do double the work. For what? So I can run a computer with less crashes?

First, on XP if people would understand the limitations of how many programs they can have open at once before their computers crash they wouldn't have that many problems because they wouldnt have unrealistic expectations of what their computers can do and 2) Windows 7 is far more stable then XP ever was and as businesses begin to transfer over to it most of those "stabiuloity problems" will simply disappear. For example, on my personal PC, I can run Adobe Design suite, Office applications, and surf the net at the same time and I can't remember 7 crashing on me. Windows has caught up a lot in the stability area with Windows 7. That was the only real benefit Mac ever had over Windows previously.

There is no need for virtual Windows. It is mostly a fun toy for computer geeks, not a real business application.