Blender requires that Python programming language be installed to access all menu items, etc.

But Blender doesn’t ‘see’ all versions of Python, apparently it only sees the version installed on your computer that Blender was compiled with.

It may be otherwise on your computer, but until I matched the version the command line window shows, Blender said it couldn’t find any version of Python on my system.

I had installed Pythin 2.7.1, and it was looking for version 2.6.2. I had to uninstall 2.7.1 and do a search for 2.6.2. Found and installed it, Blender is happy now.