Internet Sharing Problems

I'm having some problems with the new network I've setup in my house.
For some reason I cannot share the Internet Connection as I used to be
able to. Here's a diagram of how my network is set up.

[image: http://img229.imageshack.us/img229/1609/diagramqn7.jpg]

As you can see from the Diagram above the Internet connection is coming
from a USB Speedtouch 330 Modem. The connection is then shared
wirelessly from the Main computer to the Netgear ME102 Access Point.

After this there is a wireless connection to the secondary computer,
the Secondary computer has a Wireless USB adaptor, this works fine and
the Internet Connection shared from the main computer works on the
Secondary computer.

There is a third computer connected to the secondary computer which is
wired using crossover cable, all I get from this is Limited or No
Connectivity and the third computer will not detect an Internet
Connection.

The Main & Secondary computers are in a Workgroup, the third is not,
but even if it is in the Workgroup the Message still displays, also to
note the Third Computer used to work by using the secondary computers
Internet Connection even without being part of the Workgroup, which is
what I want it to do now. The old configuaration was an additional
Network card in the Secondary computer and another ME102 Access Point
Connected to the secondary computer.

All computers have a Fresh Install of Windows XP Home Edition Sp2.


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