I have a small LAN set up, with the primary computer running XP Home, for the purpose of sharing the Internet access. The LAN was set up by the standard Windows wizard and works (or appears to) but the other computers cannot access the Internet.
The moment I dial the Internet connection, an error event shows up in the system event viewer: Event ID 32003, source IPNATHLP. Restarting the ICS service manually results in the same error.
From the details in your system event viewer, it is clear that your problem lies within the Windows NAT area. I should note out to you that in the case you are using AOL v7, then ICS (Internet Connection Sharing) will not work because is it not supported by the specific AOL version.
There are a few ways to solve your Internet sharing problem, and because of the complexity Windows has, a number of actions can result in your Internet sharing to start working, something I have seen countless of times.
First, Microsoft has a step-by-step tutorial on how to enable the Internet Sharing, it also includes a few Windows media videos to help you through it. It would be a good idea to have a quick skim through it, just in case it shows you something new: http://support.microsoft.com/default.aspx?scid=kb;EN-US;306126
Second, from the various articles I have read, I've come to the conclusion that there is no way to simply 'uninstall' ICS. This is probably your biggest problem. If you cannot get ICS working after reading the above article, then I would suggest you try to remove all network adaptors from your device manager and reinstall them, hoping it will successfully bind NAT to the correct network card and resolving the problem.
Should you receive new errors, then I would point you to http://support.microsoft.com, where you can search for the particular error and hope that there is a solution for it!
Due to the nature of your problem and the limited user intervention into the system, that has been placed by Microsoft, your going to have to patiently try the above steps, and possibly some, to get it working.
Of course, all the above implies that reinstalling is not an option. If that's not the case, then a simply reinstall will be the fastest way to fix it:)
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