if he is getting the error in any drawing, I would uninstall AutoCAD + clean all files associated with it (including registry), check device manager whether everything works fine and no drives are missing. Install Acad back ... sometimes it is easier and faster to uninstall and put it back than searching for cause :)

Thanks for the reply, just added a hotfix to see if it works. Very greatful for your help.

Hi, i have re installed the program but it still seems to be the same. Any other idea's that i can try.