Internet Connection Sharing: No Internet Access

Hang on, Ben, I'm getting confused here, could you please post an updated version of the various ipconfig outputs? I thought the main PC's IP was 10.0.0.7...

sure, i had to change the ip because my wifi decided that it had to change ip after i reset it, it took the 10.0.0.7 slot

Laptop:
Ethernet adapter Local Area Connection:


Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) 82579LM Gigabit Network Connection
Physical Address. . . . . . . . . : 2C-27-D7-80-23-B1
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::65bc:9591:56a3:22c%18(Preferred)
IPv4 Address. . . . . . . . . . . : 10.0.0.8(Preferred)
Subnet Mask . . . . . . . . . . . : 255.0.0.0
Default Gateway . . . . . . . . . : 10.0.0.138
DHCPv6 IAID . . . . . . . . . . . : 187443159
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-16-CB-C6-50-2C-27-D7-80-23-B1
DNS Servers . . . . . . . . . . . : 10.0.0.138
NetBIOS over Tcpip. . . . . . . . : Enabled


Wireless LAN adapter Wireless Network Connection:


Connection-specific DNS Suffix . : BigPond
Description . . . . . . . . . . . : Intel(R) Centrino(R) Advanced-N 6205
Physical Address. . . . . . . . . : 08-11-96-7A-49-70
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::d518:1b52:896f:3976%11(Preferred)
IPv4 Address. . . . . . . . . . . : 10.0.0.7(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Tuesday, 19 June 2012 6:15:41 PM
Lease Expires . . . . . . . . . . : Wednesday, 20 June 2012 6:15:41 PM
Default Gateway . . . . . . . . . : fe80::c9ca:9f70:c9c7:7b77%11
10.0.0.138
DHCP Server . . . . . . . . . . . : 10.0.0.138
DHCPv6 IAID . . . . . . . . . . . : 218632598
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-16-CB-C6-50-2C-27-D7-80-23-B1
DNS Servers . . . . . . . . . . . : 10.0.0.138
NetBIOS over Tcpip. . . . . . . . : Enabled



Main PC:
Ethernet adapter Local Area Connection:


Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller
Physical Address. . . . . . . . . : B8-AC-6F-DD-07-9A
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::14fc:4d5e:2725:fc1%24(Preferred)
IPv4 Address. . . . . . . . . . . : 10.0.0.8(Duplicate)
Subnet Mask . . . . . . . . . . . : 255.0.0.0
Autoconfiguration IPv4 Address. . : 169.254.15.193(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . : 10.0.0.6
DHCPv6 IAID . . . . . . . . . . . : 414755951
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-15-6D-0C-FA-B8-AC-6F-DD-07-9A
DNS Servers . . . . . . . . . . . : 10.0.0.6
NetBIOS over Tcpip. . . . . . . . : Enabled

OK, now both ethernet cards are using the same IP, which might be a bit of a problem, try changing the host PC's IP address to .9 or .10 or whatever else you like.
Also, how do you connect to the internet? I'm puzzled as to why the DHCP and DNS services are running on a machine that seems to be on the local network.

fixed the ip problem, i connect using wifi on the laptop

So what's the new IP?
For the connection i meant what kind of a connection it is, ADSL?

main pc is 10.0.0.9
Laptop is 10.0.0.8

I have ADSL2

OK, so now if you try and ping 10.0.0.8 from the host PC what happens?

successfully pinged it

OK, now set the host PC's DNS and DHCP to 10.0.8, the new IP for the laptop's ethernet card and ping again

like this for dns and dhcp?