Using CleanWipe and the manual uninstall instructions for Symantec Endpoint Protection both did not resolve the Teefer 2 problem for me.
In my case, device manager listed my network card twice, but one of them said something like (Teefer 2) at the end. It also listed a third device related to Teefer 2. For example:
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Realtek Gigabit Ethernet NIC
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Realtek Gigabit Ethernet NIC (Teefer 2)
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WAN Miniport (IP) - Teefer 2 Miniport
Here's what I did (WinXP):
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Open Device Manager.
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Right click on the Realtek Gigabit Ethernet NIC (Teefer 2) and choose Disable.
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Right click on the Realtek Gigabit Ethernet NIC and choose Uninstall. Both of the NIC should disappear.
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Click Scan for Hardware Changes.
When I did this, the Realtek Gigabit Ethernet NIC was automatically detected and installed, but the Realtek Gigabit Ethernet NIC (Teefer 2) was not! I was instantly able to access the internet! Note that the WAN Miniport (IP) - Teefer 2 Miniport still shows in my device manager as Disabled and doesn't seem to affect anything.