I have a Dell Inspiron 15R (N5010) purchased in fall 2010 that came with Word and Excel Starter editions.  It has a drive Q under My Computer labeled "Microsoft Office Click-to-Run 2010 (Protected)".  When I click on Microsoft Office in the start menu it prompts me to either purchase an activation key or enter one I already have.  I bought Microsoft Office Professional Plus 2010 that came on disks with a product key.

My question is if I enter this product key into the program apparently already installed but not activated on my computer will I have access to all the available features that come with Office Professional Plus 2010?  Or do I need to install the disks?  I can't find a clear answer to this on the internet but I'm probably just missing it.  If someone has experience or knows for sure that'd be very helpful.  Thanks!