How to pick what adapter is used for internet axs

This is probably a very easy thing to figure out/fix, but for the life of me i cannot find the solution. I normally access the internet through my wired network connected to a router and my high speed modem. Now the last few day my ISP has been having issues so my wired connection is unstable and barely usable, while they fix the issues with their network i have been using my Iphone to get net axs, but to do so i have to disable the onboard NIC so win7 will access the net through my Iphone. The only problem is i need access to my NAS unit while i'm online but since i have to disable my on board NIC for windows to use my Iphone to get on the internet i cannot have both networks active at the same time. So my question is how can i have my NIC active to access my local network and NAS while using my Iphone to access the internet? I cannot seem to find any sort of settings telling windows which adapter to use to connect to the internet, it defaults to my onboard NIC if its active.

any help would be great.

I'm using the Iphone "personal hotspot" function to get internet access while my highspeed is down, it shows up as "network 2" in my network&sharing center, and as "apple mobile Ethernet device" under the "change adapter settings" in the sharing center. What i want to be able to do is tell windows to use the Iphone for the internet while keeping my wired network active so i can access my NAS. but so far i can only get windows to use the Iphone for the internet if i disable my on board Ethernet adapter, hence i lose access to my local network and NAS unit.

Windows IP Configuration

Host Name . . . . . . . . . . . . : PJ-PC
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection 2:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Apple Mobile Device Ethernet
Physical Address. . . . . . . . . : 56-26-96-B7-A5-35
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::fcd4:17d7:a93:1e86%14(Preferred)
IPv4 Address. . . . . . . . . . . : 172.20.10.3(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.240
Lease Obtained. . . . . . . . . . : July-25-14 7:49:15 PM
Lease Expires . . . . . . . . . . : July-26-14 7:34:50 PM
Default Gateway . . . . . . . . . : 172.20.10.1
DHCP Server . . . . . . . . . . . : 172.20.10.1
DHCPv6 IAID . . . . . . . . . . . : 324413078
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1A-A2-AB-4D-1C-6F-65-3D-5E-C8
DNS Servers . . . . . . . . . . . : 172.20.10.1
NetBIOS over Tcpip. . . . . . . . : Enabled

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller
Physical Address. . . . . . . . . : 1C-6F-65-3D-5E-C8
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::25be:2b44:2a37:9462%10(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.101(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : July-25-14 3:24:28 PM
Lease Expires . . . . . . . . . . : September-01-50 2:18:45 AM
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DHCPv6 IAID . . . . . . . . . . . : 236744549
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1A-A2-AB-4D-1C-6F-65-3D-5E-C8
DNS Servers . . . . . . . . . . . : 192.168.1.1
NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter isatap.{28D35C9D-C879-409E-84A6-3399578938CA}:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Teredo Tunneling Pseudo-Interface:

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
IPv6 Address. . . . . . . . . . . : 2001:0:9d38:6abd:2856:d8c:3f57:fe9a(Preferred)
Link-local IPv6 Address . . . . . : fe80::2856:d8c:3f57:fe9a%12(Preferred)
Default Gateway . . . . . . . . . : ::
NetBIOS over Tcpip. . . . . . . . : Disabled

Tunnel adapter isatap.{6DCCDC28-06EC-40B9-8054-DB7B8C3C1EFF}:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Kaktussoft said:

The problem is: All network traffic to unknown remote networks (the internet) will be routed through the "default gateway" which is router behind the network card (ip address of home router). Steps to do after network card has its tcp/ip address.

1. In Elevated Command Prompt :
   
   Code:

   route  /delete  0.0.0.0

2. reestablish (disconnect/connect) the tethering connecting to the iphone.

Post results

this didn't seem to do anything at all.