Programs no longer compile after Windows 10 upgrade.

Yesterday I upgraded to Windows 10 from Windows 7.
Everything was working OK with Windows 7 using Arduino 1.6.7 .
Now after the upgrade none of my programs will compile. I tried programs that once worked just fine from 2014, 2015, and 2016. None will compile.

The error message is a long list of libraries that it says are all now " invalid ".

Any hints on this ?

Please copy past the whole error. Also tried to reintall the Arduino IDE?

You may need to look at the preferences dialog in the IDE and reset the folders for your library and sketches.


I will give that a try.