Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
That is a Window Access Rights issue, Sometimes windows gets a little "stupid" and does not give itself the appropriate access.
Too bad they slipped in that "unknown" prefix. Makes it much harder to find the right key.
Code 1401, 1402, 1406 Error or “program not installed for current user” “Setup cannot create Registry Key” “Setup cannot write the value to the registry key”- Error Installing Office or Opening Office App or Office File - FIX IT - Manual fix OPA11.dat / Opa12.dat / DATA.dat-
http://support.microsoft.com/kb/838687
http://quicksolver.blogspot.in/2012/02/unable-to-install-office-2010-or-office.html
<snip> Found the solution - Actually it was contained in one of the other numerous Questions on this same error. Simply run the command:
"secedit /configure /cfg %windir%\inf\defltbase.inf /db defltbase.sdb /verbose"
and that took care of the problem in a few seconds! </snip>
How to trouble shoot problems that you may experience when you try to activate an Office product
http://support.microsoft.com/kb/903275 opa11.dat/opa12.dat data.dat Apparently this still applies to 2010