How to uninstal Gateway ?

I muddled up wireless broadband access to my home
network and have not yet restored it. Network merely
links upstairs PC (XP) to downstairs PC (Win98SE)
with router and wireless modem, thus out to Internet.

Fiddling with the XP PC and not particuarly knowing
what I was doing, I created an Internet Gateway in
case it helped. But it did not: and I later managed
to delete it.

But via network the Internet Gateway had loaded
itself onto the Win98 PC, host (via router) to broadband
Internet access: so the Gateway loads at boot and (I
suspect) prevents access. How can I remove this?

--
Don Phillipson
Carlsbad Springs
(Ottawa, Canada)