Do not reinstall Apache or Wamp in its entirety if you see these errors. Those who suggest doing that are wrong.
Apache doesn’t start back up after Windows 10 update/reboot → Run
netstat -ao → What’s running on port 80? Pid 4?
If Pid 4: Task Manager → Details tab, confirm. Pid 4 = System, IIS (internet information service). Go to Control Panel → Administrative Tools → Services → World Wide Web Publishing Service. Disable and turn off automatic startup.
Something else? Change Apache port. Go to httpd.conf, change:
Listen 0.0.0.0:8080 Listen [::0]:8080
Update in httpd-vbhosts.conf. Add 8080 (or whatever you changed it to) to Firewall exemptions for Wamp.
“You don’t have permission to access / on this server.” → httpd-vbhosts.conf port didn’t get updated.
Apache running correctly but website not accessible → Check Firewall settings.