What can I do if the WLAN of the HG630a is not encrypted and the computer cannot access the WLAN?

Step 1: Delete the settings of wireless network connections from your computer.
Using a computer that runs Windows XP as an example, delete the settings of wireless network connections by doing the following:
1. In the Control Panel window, double-click Network Connections to display the Network Connections window.
2. In the Network Connections window, right-click Wireless Network Connection and choose Properties.
3. In the Wireless Network Connection Properties dialog box, click the Wireless Networks tab.
4. In the Preferred Networks group box, select the latest wireless network connection saved on your computer, and then click Remove.
5. Delete all the other wireless network connections from the Preferred Networks group box.
6. Click OK.

Step 2: Create a wireless network connection that is not encrypted.