For some problems in my PC it was need to restore Windows 10 and when I tried to launch Qgis (2.16 and 2.14) a message from Windows appeared (see image in attached; sorry, the message is in italian):
So I decided to Unistall Osgeo directory and install it again using OSGeo4w install. Everything worked fine untill it was installing qgis-common. At that moment the previous Windows message appeared again. After OK, installation continued and at the end appeared:
OSGEO4W message - Postinstall script error "Package: qgis-common, qgis-common.bat code-1073741521".
So I decided to install Qgis 2.14 but I had always the same problems. Somebody can help me? .