If using a disc, open the x64 folder in the installation root and run setup.exe .
If you already own a legitimate product key, you are in luck. The safest way to get the 64-bit installer is to use your original backup media or look for verified ISO mirrors from reputable software archives. office 2010 free download 64-bit
If you cannot find your old product key or are worried about the lack of security updates, there are several modern ways to get the "Office experience" for free or at a low cost. If using a disc, open the x64 folder