Product Key Finder
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Full user review
"STOP! Read the 3rd sentence in 2nd paragraph of review!"
If you need a tool that only displays the OS key, then Product Key Finder is for you.
I did not download this because it says OS (Operating System / WINDOWS) key only. (even though I was searching for OFFICE KEY VIEWER)
I went to their website, single page and it only displayed a Network License Reporting program, when I tried to run that, it reported it needed IIS prior to install.
SO, If you ONLY NEED your WINDOWS product key, get this. If you need your OFFICE KEY, this is NOT your program.