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If the ICS installation not successful, check the following:
Verify that Internet connectivity is functional from the ICS host computer before sharing the connection.
Check that the interface to be shared is compatible with ICS. One-way connections, such as a satellite connection that uses both a satellite interface for download and a dial-up connection for upload are not compatible with ICS in Windows XP.
Ensure that the proper interface is being selected as the shared connection. The shared interface should be the one that is connecting to the Internet.
If you are trying to configure ICS manually for a connection, ensure that the home network adapter does not have ICF enabled. If ICF is enabled, you must either disable it before you can configure ICS on the external connection, or use the Network Setup Wizard to enable ICS. The wizard disables ICF on home networking interfaces.
Verify the IP address on the shared connection to confirm that it is obtaining an IP address from your ISP.
Verify the IP address on the internal adapter to confirm that it is assigned as 192.168.0.1.
If it is not, disable ICS on the shared connection and ensure that the internal adapter is configured to obtain an IP address automatically, and then enable ICS on the shared adapter.
Check the System log and the Nsw.log file for errors that are related to ICS configuration. To view the contents of Nsw.log, click Start, click Run, type nsw.log, and then click OK.
Your problem sounds kind of odd so maybe try these things out, especially check out whether your wireless antenna is compatible with ICS. Good Luck :)