nSpaces: Multiple virtual Desktops With Password Protection and easy switch
Fetures of nSpaces

Launch Desktops: Create multiple desktops on your computer.
Launch Apps: Open different applications on each separate virtual desktops to improve your productivity.
Name your space: label your tag for each virtual desktop, the tag is shown on the space switcher.
Change wallpaper: Your desktop is unique, Set a custom desktop image for each of your desktops and watch as the pictures fade into each other when switching between your desktops.
Color your space: If you don’t like to set a custom image for each desktop, just set a background color for them.
Protect your space: If you don’t like anonymous users to use your spaces, just set a password for them.
Hotkeys for everything: nSpaces has a group of hotkeys for each desktop you created, hotkey for the space switcher.You can change whatever you want.
Using Nspace is very easy and simple GUI based menu driven. Fast to configure and make changes and save.

Download
http://www.bytesignals.com/binary/nspaces/setup.exe