All depends on which version of Office 2010 you bought. If it was a transferrable version you can get the key from your existing PC where it is installed with Belarc Advisor -
http://www.belarc.com/free_download.html
You can download the installation files from
http://www.heidoc.net/joomla/technol...download-links#
Make sure you download the correct language version of the product you bought as keys are product specific.