This question already has an answer here:
I'm new to GIS but have been learning QGIS for the last few months. I have Windows10/64bit system and I just installed the latest QGIS version 2.18.10, but now I get an error when attempting to run GRASS plugins from the processing toolbox. Error is as follows: "This algorithm cannot be run :-( It seems that GRASS GIS 7 is not correctly installed and configured in your system. Please install it before running GRASS GIS 7 algorithms."
I have seen many post on this topic and have tried every suggestion to fix it to no avail.
I have completely uninstalled, including cleaning up the registry, re-installed 2.18.10 and still same issue.
I'm about to uninstall again and revert back to 2.18.08 which was working prior to this last update. But want to reach out and see if someone has a better solution prior to doing that.