Three database server install in my pc.
                            
                         
                        
                     
                 
                
                    Hi,
I want to install three database server.
1. mysql
2. sql
3. xamp 
mysql and sql databse server run successfully.
but when i install xamp databse server it gives following error
   Problem detected!
   Port 80 in use by "Unable to open process" with PID 4!
  Apache WILL NOT start without the configured ports free!
  You need to uninstall/disable/reconfigure the blocking application
  or reconfigure Apache and the Control Panel to listen on a different port
     
how to install three database server ?
Thanks