Try a complete uninstall deleting the register keys and the .qgis2 plugin
folder.
http://osgeo-org.1560.x6.nabble.com/How-to-quot-uninstall-purge-quot-QGIS-in-Windows-td4644899.html
Nicolas Cadieux M.Sc.
Les Entreprises Archéotec inc. 
8548, rue Saint-Denis Montréal H2P 2H2
Téléphone: 514.381.5112  Fax: 514.381.4995
Le 2014-12-05 03:34, "takacsviki [via OSGeo.org]"
<[email protected]> a écrit :
Hi All ! The following message appeares instead of starting qgis 2.2
For a long time i have used the program, with a lot of work in it. Suddenly the
following error message appeares and it did not start. I have uninstalled and
isntalled again the program, also I have tried to install 2.6 version, after
installation the same error message appeares. What should I do? The program
starts and during "filtering files" this message appeares and after it stops
working. Thanks for help: Viktoria
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