Palette blocks not in the install - are they downloadable anywhere

"C:\Program Files\Autodesk\AutoCAD 2013\Sample\en-US\Dynamic Blocks\Mechanical - Imperial.dwg" for block "Hex Head Bolt - Imperial" not found.

There is not a en-US sub-folder in the Sample folder.  Windows 7, 64bit install.

There isn't a folder called "Dynamic Blocks" anywhere on the Hard drive, at least that the "search" was able to locate.

Thanks!

M.