It happens some times when you install a particular application like skype or any other application which connects to internet through a particular port but that port may be used by some another application due to which the new application may not work properly.
In order to make the application work you will need to release that TCP/UDP port, you can easily terminate the program using that port by using a free utility called CurrPorts
CurrPorts allows you to close unwanted TCP connections, kill the processes which are using those TCP/UDP ports.
CurrPorts displays list of all the opened ports including the TCP and UDP ports, it will display some entries with pink colour which indicates the suspicious TCP/UDP ports owned by unidentified applications.
CurrPorts is a freeware program, it doesn’t require installation process or additional DLLs. In order use it, just copy the executable file (cports.exe) to any folder you like, and run it.