Kommer bara in på sidor med https://

The Service Pack 2 update for Windows XP installed a firewall that automatically turned on in the operating system.
If this firewall has been turned off, your computer may not be protected against internet threats.
You can turn the firewall back on with a few quick clicks of your mouse, giving your computer protection against hackers, malicious software and other threats.

1. Click on the "Start" button and click on "Run." This opens the Run window.

2. Type "Firewall.cpl" without quotes into the Run window and then click "OK" on the Run window.

3. Click the "On (recommended)" option in the Firewall configuration window and then click the "OK" button. The firewall is immediately restored and turned on.

How to reset Windows Firewall settings in Windows XP SP2

There are situations where-in you need to reset your Windows Firewall settings, after removing a Trojan etc. Resetting the Windows Firewall sets the configuration to factory defaults by removing all the programs / port / exceptions settings.

To reset the Windows Firewall to the factory default state, try this:

Type firewall.cpl in Start, Run dialog.
Click the Advanced tab.
Click the Restore Defaults button.
Click Yes to continue when you see this dialog

Restoring the default settings will delete all settings of Windows Firewall that you have made since Windows was installed. This may cause some programs to stop working.

Do you want to continue?

The Windows Firewall is now turned ON, and set to factory default state.

Alternately, you can use the NETSH command-line to accomplish this:

Open a Command Prompt window and type NETSH FIREWALL RESET

This command resets firewall configuration to default. This provides the same functionality as the Restore Defaults button in the Windows Firewall interface.