must have ndiswan installed

I recently tied to install AOL 9.0 on my computer and got
an error diolog box that read:

NETWORK
! WAN Miniport (ATW) must have ndiswan installed
OK

I clicked OK and it continued to load until it got to a
point when it restarted and the same error came up again,
and it kept coming up over and over so I finaly used my
GoBack program and went back to before I installed the
program. Could anyone please give me some insight as to
what to do to fix this problem.
Thank You,
Michael