Previously activated Office 2010 constantly loses activation
In some cases, a previously activated Microsoft Office 2010 installation may lose its activation.
Reapply the MAK does not help as it loses activation immediately thereafter. Querying the Office 2010 activation status confirms it is activated, then activation is loss without explanation. Conventional methods as described via the Microsoft Technet forum link below do not work.
In this situation, the Office Software Protection Platform Service may have a corrupt tokens.dat and cache.dat which needs to be removed and the MAK re-entered.
- Type in services.msc in the search box and stop the service called Office Software Protection Platform
- Go to C:\ProgramData\Microsoft\OfficeSoftwareProtectionPlatform and rename tokens.dat to tokens.old
- Go to C:\ProgramData\Microsoft\OfficeSoftwareProtectionPlatform\Cache and rename cache.dat to cache.old
- Restart the computer and open any Office program. You’ll be asked to retype your product key and then restart again. Again open any Office program and you may have to type in the key one more time. It will then ask you to activate online and you’re good to go.
http://helpdeskgeek.com/office-tips/fix-office-2010-cannot-verify-license-error-message/