I have just installed these games on a windows 7 laptop. The games seem to work apart from the fact that a left mouse click is not recognised. Using the Enter key seems to be equivalent to a left click, so I can start the game and move around to see that everything else seems to be working fine (no graphics issues etc).

I have not tested to see if the same issue exists with Dracula 3.

Has anyone else experienced this issue, and Is there a known way to fix it?

Try restarting your PC. ;)

Embarrassingly I hadn't tried restarting my PC, but sadly now that I have it doesn't seem to have made any difference.

Hmm, try re-installing the game (with admin rights).