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(after installing ICS with AOL as the ISP - Win95/98)

This is a known problem with the Internet Connection Sharing (ICS) service, and Microsoft has provided support articles Q241344 & Q238550 concerning this problem. It may apply to you if have:
Causation & Fix
The problem occurs if ICS is installed when both AOL & Dial-Up Networking are installed, as TCP/IP (shared) will bind by default to the Dial-Up Adapter rather than to the AOL Adapter. This means that you either: One or the other.

The fix is to:

In the support articles (above) that I've read Microsoft says to do this from Network Neighbourhood. However, I'm sure that this is a mistake, & that it should read Network.