If you want to display the version of your Windows 7 on your desktop, here is a simple registry hack which will help you do it.
Open regedit and navigate to the following key:
HKEY_CURRENT_USER\Control Panel\Desktop\PaintDesktopVersion

Double click on PaintDesktopVersion in the RHS and in the box that appears, change the value to from 0 to 1
Restart.
Can be especially useful if you are running multiple virtual machines in differing states of service packs.
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