Software update for Web Servers running WSS or MOSS

Scenerio1:
1. Installed any new hot-fix on Web server having WSS and MOSS installed
2. Run the Configuration Wizard as post installation steps
3. Restart the Web Server

Error:
One of the services failed to start
4. Goto Run >> services.msc
5. Check all the Windows SharePoint Services status.

Scenerio2:
1. Installed any new hot-fix on Web server having WSS and MOSS installed
2. Run the Configuration Wizard as post installation steps
3. Navigate to the Main site ( e.g. http://localhost )

Error:
Server error:
http://go.microsoft.com/fwlink?LinkID=96177

Reason:
Make sure to read the following article and follow it http://technet.microsoft.com/en-us/library/cc288269.aspx