I just purchased CM 10 and after installing it the menu options across the top will not drop down (eg. 'file, edit, game, actions, mentor, etc. Why would this happen? Is there some sort of driver imcompatibilty or something? Thanks to anyone who can help...

Read the Chessmaster 10th Edition FAQ... the problem is most likely that you need to lower your DPI settings.

You should also install all the patches as well... that way you can run without the CD.