VMware Port Configuration Problem. Don’t know what to use.

VMware experts I need help! I was running through steps on the setup of VMware when under Configure Ports an error just popped up. It says Port: 80 is invalid or already in use.
The note also has this range of numbers 1-65535, 389-636 and 1025-65535. If it is invalid, 80 sure is in-between 1-65535 but not on the other ranges and if it is in use how do I know who is using Port 80?

The Following port numbers are either invalid or already in use.
VMware VirtualCenter HTTP Port: 80
Note:
The vCenter Server ports must be in [1 – 65535] range.
We The LDAP and SSL ports For the Directory Services instance must be 389 and 636 respectively or in the range of [1025 – 65535].
OK
Thanks,
Jose
