Validating wireless connection
Run a Command Prompt window from the wireless client's Start menu and use it to ping your AP or router's IP address with the Internet Control Message Protocol as shown in Figure 5.
If your wireless client still cannot connect, get a valid IP address or ping your AP or router, then it's time to consider wireless-specific problems.
Unless the WLAN is open (unsecured), the AP or router and client must also have (or dynamically receive) the same keys used to encrypt traffic between them.
To fix, you go into the properties page of your wireless connection, go to "Wireless Networks" tab and then to Properties of the chosen wireless network you are trying to connect to.
Click on the Authentication tab and now uncheck the Enable IEEE 802.1x authentication for this network box.
If the box was checked, then that was why you were getting the “unable to find a certificate to log you on to the network” message because Windows is looking for one, but your wireless router is not setup for certificate security. " From: Upgrade to SP3 and you should be able to connect to your network.
Right click on the network icon, select properties, then the tab for Authentication. If you have an antivirus with firewall, make sure to also deactivate windows firewall.
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I have a laptop with a Dell D630 with Wi Fi power switch on the side.i tried unchecking the enable authentication box under advanced settings but still no result.