Can't connect and this is the message in VNC Server Information Center: Port conflict preventing direct VNC connections over TCP. The port on which VNC Server is expecting to receive direct connections is in use by another program or service. For example, it may be that VNC-compatible Server software from a third party is already listening on this port. Firewall is turned off but added a rule any way.
Ran this command and nothing else is using port 5900
C:\Users\administrator>netstat -ano | findstr 5900
TCP 0.0.0.0:5900 0.0.0.0:0 LISTENING 4760
TCP [::]:5900 [::]:0 LISTENING 4760
Name PID Status User name CPU Memory (private working set) Description
vncserver.exe 4760 Running SYSTEM 00 10,544 K VNC® Server