NIS2009 to NIS2010 problem

I have NIS2010 installed on my HP desktop. My product code is for 3 machines. I just bought an HP laptop that has a 60 day trial with NIS2009. First, I entered my product code and used my 2nd key and it updated my subscription correctly. Then, I tried to download NIS2010. But I get a window that says the NIS2010 is a different language then the NIS2009 that was pre-installed. But both are in English. It sent me to a help site that says to uninstall NIS2009 and then install NIS2010. But I am concerned that this might use my 3rd and last key. Any suggestions?