AutoCAD 2013/2014 Problem

Hi, 

I've got a problem which has presented with Autocad 2013/2014, in normal and architecture versions, don't now if any others might show the same problem. The main dropdown menu won't work. Once it opens, I click on any icon and (apart from showing to the left the options which don't work either) the menu closes. No boxes open. Not open, new, options, any. Plus, commands just make the program crash. From line, to filedia. Can't do anything. 

I'm running win8 x64 and I've already tried .net solution, don't have a phone pluged, reinstalled several times, cleaned registry, nothing has worked. 

Has anyone have had this problem? Is there anything causing it?

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