It shouldbe showing as a tiny icon in the system tray - and look like this (with or without the exclamation mark)
It is supposed to be a picture of a cloud.
If the icon is not showing, run Cloud from the Start Menu by typing in "Cloud" then click on "Adobe Creative Cloud".
A Panel will appear and you then click on the "cog Wheel" as shown below:
Select "Preferences" from the menu which shows, then make sure all four oiptions are ticked.
Then close this panel via the "X" at the top right. The icon should then be showing in the system tray
as mentioned earlier.
I hope this helps :-)
The exact thing just happened to me, it is gone. Not showing up on search.