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Cannot connect to internet from the notebook, please help!

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I am having terrible trouble connecting my friend's notebook to the internet. She has a wireless DLINK router and her laptop works fine, but the notebook is not connecting at all. It used to work fine a couple of weeks ago, but suddenly stopped working/connecting last week,
The notebook is running Windows XP Home Edition Service Pack 3. When I boot the notebook up it tries to connect and I bring up the list of wireless networks and it says 'Aquiring Network Address' and then it changes to 'Limited or no connectivity'.

When I go to the properties of the wireless network adapter and go to the Wireless Networks tab, it states the Dlink is Automatic and when I click on the properites of the Dlink the Network Authentication is currently set to 'Open' and the Data encryption is set to WEP. Could this be the problem perhaps?

One other thing we have tried is connecting to the internet with a wired connection and this works fine, it is just connecting wirelessly we having problems connecting.

Another thing I have tried is uninstalling the wireless adapter. Windows XP then re-installed the adapter automatically when I rebooted the Notebook, but it's still not connecting. I then got an error message saying that Windows was unable to find a valid security certificate to connect to the Dlink network, so I unticked the 'Enable IEEE 802 1x authetication for this network' box and I stopped getting this message but I still can't connect.

We are a little baffled because the Laptop (which is running Windows 7) is working and connecting to the internet fine from the same wireless router but the Notebook isn't. I'm pretty sure because of this that it is a simple setting somewhere that needs changing, but can't figure out what or where to go/look.

Any help or advice would be much appreciated, thanks.
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I will be glad to offer assistance. First of all from what you are telling me it would appear your DLink router is using "OPEN" authentication. I would recommend you change this as this means anyone within range of your wireless network can connect and access any computer on the network. This is a security issue more than anything. Secondly, to solve your problem more info will be needed. Could you do the following: Go to start -> run -> type cmd -> type ipconfig /all -> print screen the full output -> paste it into paint or something -> save it and upload it. I will then try to work out what is happening. It is important to do this when your computer is in the state you are saying i.e. not connected. Also, I will help secure your network step by step if you wish because your current configuration isn't ideal. Here is an example of what you should be uploading: Windows XP Professional-2010-08-22-11-27-04.png

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