Satellite C660 - Microsoft Office asks for serial number

I am supposed to have microsoft office 10 installed on Satellie C660 but keeps asking for number which my serial number doesn't work, used 3months free trial now can't find the original software.
Please help.


The preinstalled Office version is just a trial version as you wrote. If you want to use Office after this trial version you have to purchase it.
The key on bottom side of your notebook belongs to preinstalled Windows version and has nothing to do with Office.
You have to purchase it ;)