In your case you should first uninstall all the 6 to 4 tunnel adaptors as it seems you have too many of them which can cause connection problems.
You can do it manually by going into Device Manager, top of page to "View" tab then choose "show hidden devices" look to Network Adaptors and uninstall all the tunnel adaptors you see there and reboot your system, a new one will be created automatically.
I also have a file that will do this for you automatically.
Thank you, chev65! I have done as you recommended and removed the tunnel adapters using your attachment. I also ran the IPReset .exe and let my computer restart. I'm still unable to connect to the internet, I'm afraid.
This is what my ipconfig now looks like:
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
C:\Users\Melissa>ipconfig/all
Windows IP Configuration
Host Name . . . . . . . . . . . . : Melissa-laptop
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
Ethernet adapter Bluetooth Network Connection:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Bluetooth Device (Personal Area Network)
Physical Address. . . . . . . . . : 70-1A-04-57-E6-3C
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Ethernet adapter Local Area Connection:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . : NB1-DL.COM
Description . . . . . . . . . . . : Broadcom NetLink (TM) Gigabit Ethernet
Physical Address. . . . . . . . . : 00-26-B9-0D-49-1D
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Wireless LAN adapter Wireless Network Connection:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) WiFi Link 5300 AGN
Physical Address. . . . . . . . . : 00-21-6A-56-CF-AA
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::d007:b912:9892:5a13%10(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.0.14(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Sunday, August 19, 2012 1:08:04 PM
Lease Expires . . . . . . . . . . : Sunday, August 19, 2012 2:08:04 PM
Default Gateway . . . . . . . . . : 192.168.0.1
DHCP Server . . . . . . . . . . . : 192.168.0.1
DHCPv6 IAID . . . . . . . . . . . : 184557930
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-12-94-98-90-00-26-B9-0D-49-1D
DNS Servers . . . . . . . . . . . : 156.154.119.11
156.154.129.11
NetBIOS over Tcpip. . . . . . . . : Enabled
Tunnel adapter Local Area Connection* 12:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
C:\Users\Melissa>
I apologize for being such a bother!