I have installed QGIS through OSGeo4W installation. My operation system is windows 7 64x. I try to start the program QGIS Desktop from start menu this error: enter image description here

Do I need to do something? Installation was successful and re installing doesn't change anything.

  • 1
    Did you have any previous version installed using stand-alone installer on the same system?
    – underdark
    Sep 20, 2014 at 10:57
  • @underdark Yes, I have installed but I uninstalled it and tried to delete every track from that stand-alone installer
    – f.ashouri
    Sep 20, 2014 at 11:27
  • @undertake I cleaned my system completely from the previous installation and installed again and it is resolved, thanks!
    – f.ashouri
    Sep 20, 2014 at 12:11

2 Answers 2


This error is caused by leftovers of previous QGIS installs. Clean up everything and QGIS should work again.


qgishelp continues to run in the background when quitting QGis and even after uninstall / install process, which prevents some files from being replaced. Therefore run task manager and kill that process before installing.

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