Step 1: Go to Control Panel -> System and Security -> Windows Firewall.

Step 2: Click on `Advanced Settings on the left sidebar.  A new window will appear.

Step 3: Choose `Inbound Rules from the left sidebar.  Choose `New Rule... from the right sidebar.  A new window will appear.

Step 4: In `Rule Type chose the `Custom radio button. Choose `Next.

Step 5: Leave the `All Programs radio button selected and choose `Next.

Step 6: Select `TCP from the Protocol type drop-down.  Select `Specific Ports for both the `Local port and `Remote port and enter `22 for both. Choose `Next to continue.

Step 7: Choose `Next until you come to the `Name panel.  Name this connection `SSH and choose `Finish.