I had the same problem and tried the following and it worked. I found this fix in another thread related to errors.
Delete any DefaultDomain_Path folders. (Note, this may also help if the search window appears, but doesn't find anything)
a. Open Windows File Explorer
b. In the file path box type: %APPDATA%
c. Click the up arrow to go up one folder
d. Open the Local folder, in that open the ESRI folder (you should now be at: C:\Users\username\AppData\Local\ESRI)
e. Delete any folders with a name starting with: DefaultDomain_Path...