Import .dae file, python error

Hello, I’m new to Blender. When I try to import a .dae (collada) file (I think file -> import -> Collada 1.4), an error pops up saying “please install full version of Python”. That is what I did already, the Python I installed is 2.7.3. I installed Blender/Python about a year ago. Does anyone know what’s wrong? Thanks.