Router/Modem Connection Issues

Hi all, my parent's internet has always been kind of a hassle to deal with and their ISP is little to no help with any issues. I went over yesterday to take a look at it once again because its not allowing anyone to connect.

First thing it does is pop up a little window saying that the router or network (192.168.2.1) needs your computer credentials and no matter what you enter it'll just pop back up within seconds about 3 times.

Next, when you open up a browser it automatically redirects you to the router ip and gives you instructions on how to connect the router to the computer and what not, but its already connected. It will do that for any website you try and go to. My desktop also says I'm connected with internet access as well as my laptops.

http://www.windstream.com/Electronics/Tablets-and-Computer-Accessories/Sagem-1704-Wireless-Gateway-Modem/

This is the router they are using, it also doubles as a modem. Ever since they got it, it has been nothing but a giant headache

Output of ipconfig /ALL

C:\Users\curtis>ipconfig /all

Windows IP Configuration

Host Name . . . . . . . . . . . . : THE_RAIN
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : Home

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . : Home
Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller
Physical Address. . . . . . . . . : F4-6D-04-4E-A4-51
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::e037:510e:e062:e8b9%14(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.2(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Thursday, July 03, 2014 6:34:28 PM
Lease Expires . . . . . . . . . . : Friday, December 24, 2021 9:34:27 AM
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DHCPv6 IAID . . . . . . . . . . . : 385117444
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-19-65-77-FF-E0-46-9A-0A-35-3B

DNS Servers . . . . . . . . . . . : 192.168.1.1
NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter Teredo Tunneling Pseudo-Interface:

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

Tunnel adapter isatap.Home:

Connection-specific DNS Suffix . : Home
Description . . . . . . . . . . . : Microsoft ISATAP Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::5efe:192.168.1.2%16(Preferred)
Default Gateway . . . . . . . . . :
DNS Servers . . . . . . . . . . . : 192.168.1.1
NetBIOS over Tcpip. . . . . . . . : Disabled

I can also ping a website with success.

C:\Users\curtis>ping google.com

Pinging google.com [192.168.1.1] with 32 bytes of data:
Reply from 192.168.1.1: bytes=32 time<1ms TTL=64
Reply from 192.168.1.1: bytes=32 time<1ms TTL=64
Reply from 192.168.1.1: bytes=32 time<1ms TTL=64
Reply from 192.168.1.1: bytes=32 time<1ms TTL=64

Ping statistics for 192.168.1.1:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms