How to remove the existing wireless network profile in Windows Vista
Step 1
 Click start button on the task bar, open Control Panel -> (click Network and Internet, if you can´t find it, please go next) -> double click Network and Sharing Center.
 Step 2
 In the task list, please choose Manage wireless networks.
 
Step 3
 In the Network table, please select the existing profiles and click Remove.
 
Step 4
 You may see a warning dialog box, just click OK.
 
Step 5
 Then you go back to Network and Sharing Center dialog box, and choose Manage network connections -> right click Wireless Network Connection -> click Connect/Disconnect.
 
Step 6
 Click the refresh button to view available wireless networks. Select the correct network which you want to connect, double click it or click Connect button.
 
Step 7
 If the wireless network is secured, it will pop up a window asking for the security key or passphrase. Enter the correct key then click Connect.
 
Step 8
 Save the network and connection, and click Close.
 
Note:
 1. If it keeps connecting to the network or acquiring IP address, please check if you had entered the correct security key/passphrase.
 2. If it shows that the connection is Limited or no connectivity, please ensure that you had enabled DHCP server on the wireless router/access point.
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