The problem just happened to me also. 

Updating or (I suppose re-installing)  the database engine fixed it.  The error started after eitther I blue screened or deleted a bunch of unused software that probably shared the DB engine I deleted several programs because I thought they may have caused the blue screen.

Thanks for the tip.

http://www.microsoft.com/en-us/download/details.aspx?id=23734

Download this and install. It's can solve the problem