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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.

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    Did you have any previous version installed using stand-alone installer on the same system? – underdark Sep 20 '14 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 '14 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 '14 at 12:11
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This error is caused by leftovers of previous QGIS installs. Clean up everything and QGIS should work again.

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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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