1. Click Start, and then click Run.
2. In the Open box, type regedit, and then click OK.
3. Locate, and then click the following registry key:
4. In the right pane, double-click "Start".
5. In the Value data box, type "3" (without quotes), click Hexadecimal (if it is not already selected), and then click OK.
Note :- if 3 is entered it will open the port and if 4 is entered it will close the port.
6. Quit Registry Editor.