The ZuneNss.exe process is used to share media between your PC and the XBox 360 (
endgadget - about 1/3 of the way down). It is only needed if you are actively sharing music with your XBox.
If you kill the process through the Task Manager's Process Explorer, it will reload. If you want to disable the process, and free up ~25MB of memory, do the following:
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Load your Zune software
Right-click on the top bar of application (near the minimize icon)
Hover over any item with a black "fly-out" arrow
When the new menu slides out, select More Options
Select the Library tab at the top of the Options box
Under the Sharing section, click the Configure Sharing... button
Uncheck the Share my Media checkbox
Click Ok to exit the configuration options.
Click Ok to exit the Options box.
Dance a small jig since your computer is a little less bloated :taz:
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*** Remember, this will remove the ability to share music with your XBox.