I was getting the same problem.  I ended up just shutting down MYSQL, deleting the EQ directory in c:\mysql\data, and then re-running the install.bat file from the addon. 
 
It just resets all data in the database, so all chars and other things you added are gone.   
 
Not really a fix, but did get me back up and running. 
		
	
		
		
		
		
		
		
		
		
		
	
		
		
	
	
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