A firewall helps protect your mobile PC by preventing unauthorized users from gaining access to your computer through the Internet or a network. It acts as a barrier that checks all incoming information, and then either blocks the information or allows it to come through. All Microsoft Windows operating systems come with a firewall, and you can make sure it’s turned on.

To activate the Windows XP Firewall

1. Click Start, and then click Control Panel.
2. In Control Panel, double-click Network Connections.
3. In the Network Connections window, under Network Tasks, click Change Windows Firewall Settings.
4. In the Windows Firewall dialog box, on the General tab, ensure that On is selected.

To activate the Windows Vista Firewall

1. Click Start and then click Control Panel.
2. In Control Panel, select Network and Internet.
3. Under Windows Firewall, click Turn Windows Firewall on or off.
4. Ensure that On is selected. display:none

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