On early versions of Windows you may find yourself with a PC that cannot connect to anything on the network. There are a lot of reasons why you may have networking issues, such as problems with TCP/IP or issues with your computer trying to authenticate to the network itself. In some situations, computers actually authenticate to access the network using a standard called IEEE 802.1X. When this is enabled, and you try to connect to a network that does not use this standard, you can experience issues. Follow these settings to ensure this is disabled on your PC:
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Click on the Start Button.
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Click My Network Places.
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Right-click and click on Properties.
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Right-click on Local Area Connection and click on Properties.
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Click on the Authentication tab.
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Uncheck Enable network access control using IEEE 802.1X.
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Click on OK.
Hopefully that should fix the problem. If it didn't then I suggest troubleshooting your TCP/IP stack to ensure your computer is getting an IP address via DHCP or has a valid static address configured.
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