I uninstalled the drivers from Microsoft Teredo Tunneling Adapter and reinstalled the one recommended.
I rebooted but it will still not detect any wireless network.
I have a caution symbol with exclamation point on the wireless symbol area and says:
"Currently connect to:
Unidentified network
No network access "
Then the Wireless Network Connection panel will open with either one my wireless connection entries listed, including my home network. Then it will try to connect to but fails.
Trouble shooting function is of no use.
It seems I cannot turn on or off the the wireless using the Fn & F10 Keys either. No response.
Under device manager, there is no Microsoft Teredo Tunneling Adapter Icon any longer. Only the following three entries appear under Network Adapters:
1 "802.11bgn 1T1R Mini Card Wireless Adapter"
2 "Realteck PCIe GBE Family Controller"
3 "VitualBox Host-Only Ethernet Adapter"
What should I try next?

Thanks in advance,
Civitas