Here's a pretty simple one:
this website leads to a virtual desktop application for Windows. They have directions to make it portable, even, but requires things that not everybody is willing to mess with, even with the directions.
Please search next time as there is already a portable version of this in beta testing.
Welcome to PortableApps.com
iLike Macs, iPwn, However you put it... Apple is better ^_^
"Claiming that your operating system is the best in the world because more people use it is like saying McDonalds makes the best food in the world..."
I'll be sure to search next time, thanks!
Nicely polished there Ben