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I run QGIS 1.8.0 Lisboa on a Windows 7 machine. Yesterday I attempted to install the TauDEM plugin using these instructions:

Since doing this the GDAL tools for QGIS do not work with error:

The process failed to start. Either the invoked program is missing, or you may have insufficient permissions to invoke the program.

I understand this means they cannot find the GDAL executables. However, neither can I. Where actually are the GDAL executables in the QGIS folder? I assume I then have to add this manually to the Environmental Variables or into the GDAL tool settings in QGIS - is this correct?

PS. I can run GDAL tools through the OSGEO4W Shell so GDAL itself is alive and well.

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What do you mean exactly by GDAL tools? Do you mean gdalwarp and the others? – R.K. Dec 19 '12 at 12:59

They should be in the (C:\path_to\ )OSGeo4W\bin folder.

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Thanks - they are indeed there. – Ed Rollason Dec 19 '12 at 13:14
@EdRollason You might want to accept this answer if it solves your question. – R.K. May 8 '13 at 15:55

OK I solved it. In the Environmental System Variables the "(C:\path_to\ )OSGeo4W\bin" path was missing from the PYTHONPATH variable. Adding it results in all the tools working again.

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