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I have a problem with QGIS 1.8 with OSGEO4W installer (windows 7 - 64 bit). QGIS crash on startup, it shows the splash screen and then nothing. I have updated from an old 1.7.4 QGIS version. I have done the same procedure in a portable computer and it works fine. The problem is only in the workstation. Is there a log file to view what is the problem? Thank you

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try unistall and reinstall. is your workstation old? perhaps it is not 64 bit or windows 7. –  Gerald Apr 17 '13 at 15:56
    
I have tried to uninstall and reinstall QGIS and then OSGEO4W completely, but the problem doesn't solve. My workstation is relatively new, 64 bit windows 7 service pack 1, I have just controlled in control panel. –  Alessandro Battistini Apr 17 '13 at 16:06
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3 Answers

Today i stumbled on the same problem (Win 7 64-bit, QGis 1.8.0). In search of a solution i disabled all plugins (in the registry), deleted the .qgis folder, Qgis registry entries and reinstalled, but nothing helped. However, i had QGis working just fine about a week or two ago. My QGis was crashing when the splash screen displayed "Starting python" (or something similar) and i remembered that i recently upgraded from Python 2.7.2 to 2.7.4.

So, i reinstalled python 2.7.2, changed environment variables to point to python 2.7.2 and now my QGis works again. Check your python version, you might have the same problem.

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Great, the problem was this, thank you very much. I have disinstalled all version of python and purged every reference in register, and now QGis start again. Now I need only to reinstall Python 2.7.2. Thank again. –  Alessandro Battistini Jun 19 '13 at 16:18
    
@AlessandroBattistini : I'm glad you got things sorted out :) I would be grateful if you marked my answer as the accepted solution, if it helped you out :) –  Marko Jun 26 '13 at 10:54
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You may have to delete your .qgis folder. Usually under c:\windows\users\. See also: http://gis.stackexchange.com/a/57335/3438

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I have deleted .qgis folder in C:\Users\Alessandro. I have also tried to remove the registry key KEY_CURRENT_USER\Software\QuantumGIS. When I launch QGIS, it re-create the folder and the key but doesn't start. –  Alessandro Battistini Apr 17 '13 at 18:55
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I had a similar issue and I just solved the issue with Nathan W (a real Guru!). I had a file called path.txt in my c:\ and this caused QGIS-Dev build to fail (Lisboa worked fine though).

Just rename the file (c:\path.txt) if it exists. Also install OSGEO4W in admin.

See QGIS Dev install issues for details.

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