XP network help please??

Hi guys and gals. I recently had a hard drive crash and had to go out and purchase a fresh copy of XP.

Since the install, the other computers in my house can not access the internet.

I have cable internet using powerline adapters, with mine being the main source.

Nothing to the hardware was changed, but I feel perhaps I missed a step when setting up my computer's internet connections.

When I go to the network connection wizard and check the box for:
This computer connects directly through the internet and click next, it tells me that other computers can not connect to the internet through this one and in addition to it's internet connection, this computer must have a connection to your network.

Any suggestions?:confused

 

Here is another network setup help site that i found pretty comprehensive.

http://www.conniq.com/HomeNetworking_DCC.htm