If you have powertoys installed on Windows XP Its available for free at Microsoft website, visit my downloads webpage address) 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 but for desktop work it is negligible.