If your speakers are AC powered, unplug them from the AC, then re-plug them in. This has worked for me at times when the sound went out.

Jim.

Edit: You probably have a system restore point created automatically by Windows before the update was installed. Got to Settings and search for Restore Point. Click on Create a Restore Point in the results. At the top of the box that opens click on System Restore>Next to see what, if any restore points are available.