Help and user guides documentation won't load after upgrade

Just upgraded to Cubase 6, when the Help menu is selected, the Documentation and the names of the various sections appear in the drop down menu but when one is selected, a box pops up saying “Could Not Find The Manual!”

I’ve checked the folders and all the PDF content seems to be there along with an XML file.

I checkwed on Cubase 5 on the same machine, but the same thing happens there as well.

Any suggestions on this please?