http://www.ehow.com/how_6851437_reinstall-windows-firewall.html Instructions 1 Click the "Start" button found on the lower-left side of the screen and select "Run" from the Start menu. 2 Type "cmd" in the Run window and click "OK." Sponsored Links Fix My Registry Now (Recommended) Free Download. Fix Corrupt Registry in 2 Minutes. fix-registry.winzip.com 3 Type "rundll32 setupapi,InstallHinfSection Ndi-Steelhead 132 %windir%\inf\netrass.inf" in the command prompt and press "Enter" on the keyboard. Type "netsh firewall reset." 4 Close the command prompt window and access the Control Panel. Find the Windows Firewall icon and double-click it. 5 Click "Yes" when the message appears asking if you wish to restart the Windows Firewall service. Read more: How to Reinstall a Windows Firewall | eHow.com http://www.ehow.com/how_6851437_reinstall-windows-firewall.html#ixzz23ck7mNbC ======================================================================== http://answers.microsoft.com/en-us/windows/forum/windows_vista-security/windows-firewall-damaged/b9569954-7499-448d-914b-09abfa299134 Do the following to try and repair Windows Firewall: Click Start In ‘Start Search’ type cmd, then press Enter. At the command prompt, type the following command line, and then press ENTER: Rundll32 setupapi,InstallHinfSection Ndi-Steelhead 132 %windir%\inf\netrass.inf Restart Windows Click Start In ‘Start Search’ type cmd, and then click OK. At the command prompt, type the following command, and then press ENTER: Netsh firewall reset Click Start In ‘Start Search’ type firewall.cpl, and then press ENTER. In the Windows Firewall dialog box, click On (recommended), and then click OK. Now if Steps 1-3 gave a message that it could not install, skip to Step 5 and then proceed from there. Regarding the 1394 Network Adapter, let’s try dong the following: 1. Click Start 2. In ‘Start Search’ type Device Manager, then press Enter (provide administrative credentials if prompted) 3. Click the “+” sign next to Network adapters to drop down the list 4. Right-click the 1394 adapter, then click Properties 5. Where it says “Device status” let us know what it says 6. Then click the Driver tab 7. Click Update Driver… 8. If the driver is up-to-date, see if you can select the option to Roll Back Driver, and then select that