pthreadVC2.dll can't be found?

I’m using blender and i’ve installed the C++ visual 2008 like asked on the blender website. i have a windows 7 64 bit. i downloded python 3.1.2 and the installer did the rest. but when i start up blender i get an error saying. that the pthreadVC2.dll is missing. how can i fix this?

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Anyone?