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update not downloading

I have a Dell 540s. I have run into a problem with an update not downloading. The error code says to uninstall my office windows 2007. I bought a office windows 2007  good for 3 computers.  If I uninstall it I have no more download because I have 3 computers. What I need to know is if I uninstall it off this computer will I be able to reinstall it back to this computer. How does that work? Any help will be appriciated.

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