Windows Vista: How to turn on your firewall
Windows Vista comes with Windows Firewall, a two-way firewall that is automatically turned on.
Note: You do not have to use Windows Firewall—you can install and run any firewall that you choose. Evaluate the features of other firewalls and then decide which firewall best meets your needs. If you choose to install and run another firewall, turn off Windows Firewall.
For a managed, two-way firewall, try Windows Live OneCare free for 90 days.
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