Help finding python

OK for some reason i cant export 3ds or lwo havnt tried anyhting else but obj and that seems to work ok but its telling me i have no python installed??? thought some were built in?

For blender 2.45 install Python 2.5.1 from
if earlier version of Blender, check the error message and use the version of Python Blender was compiled with.

thanks so much i went and go the new blender version and the python which im hoping im getting the right processer i have pent 4 and choose x86