I am having problems when running any geoprocessing tool in ArcMap 10.3
When trying to run a geoprocessing tool, the tool window pops up, but is gray with no text and ArcMap freezes. Both windows have "(Not responding)" displayed at the top title bar
I did some research, which suggested to disable background processing- this did not solve the problem. Program still freezes with (Not Responding) at the top window bar.
Using Windows 7.
Freezes using ANY geoprocessing tool
Freezes if I go through Catalog, geoprocessing drop down menu or toolbox button
Any help to solve this not responding error would be great!