Question: how to add mdb in qgis?
Answer: Download the 64-bit version of the ODBC driver: Microsoft Access Database Engine 2010 Redistributable. If you don't have a 32-bit version of office installed you can just run the executable. ... 
Locate the qgis. bat file (mine is in C:\OSGeo4W64\bin\qgis. ... 
Open QGIS and drag the mdb file onto your workspace. Voila!