Windows 7 no aero and could not connect to the System Event Notification Service service

From this thread:
On the 14th page, posted on August 17, 2015 by Womp_Rat
Uninstall Windows Update KB2952664.
Prevent said update from installing later.
Several solutions were listed that was the only one that worked for me.
The problem occurs mostly with certain HP notebooks after windows automatically updates something.

Windows 7 SP1 Windows Update stuck checking for updates after fresh install


You will need KB-3138612 and SUR Tool. Disconnect from Internet. Reboot, stay disconnected. Install the update. Restart. Install the SUR tool, it may take a while. Restart. You may now connect again and everything should be fine.

Source: the second answer with 66 votes at the time of writing this on the superuser forums.