If you use your laptop for school and Uni then the chances are that one of these is set to your default connection, and your laptop is set to connect to any network in range if the default is not present...
Right, go to Control Panel>Network Connections
Right click on your Wireless connection and click properties.
At the top you will see a tab for Wireless Connections click it and you will see a box with Preferred Networks you should have your school and Uni networks in there, click on Veiw Wireless Networks and a box will pop up.
Make sure you have the right one because you don't wan't to connect to your neighbours network. Click on your Network and connect, make sure you type in the encryption key correctly, then go back to Controll Panel> Network Connections>Properties>Wireless Connections, and check if your Home Network is in the preferred Network box. If not you will have to add it manually....