Do you know you can have Virtual Desktops (like in Linux) with PowerToys ?

If you have powertoys installed on Windows XP Its available for free at Microsoft download webpage. It is very easy to enable Microsoft Virtual Desktop Feature. Simply right click on the Start Panel Bar also called TaskBar, Click on Tool Bar and select Desktop manager.

You would see a set of 5 icons placed on the right portion of the TAskBar. Click on number 1 to 4 to go to any of the desktops. Now you have have four different Active Desktops.
IMPORTANT NOTE: You may see a little degradation in performance.