First, I would suggest that you check to see that the card
is compatible with Win 98.
Second, Check to see if you have the correct driver
installed. Third, check first in you Motherboard (User
Manual) to see if there are any pre-assigned or shared
IRQ's for the slots on the board. You may have to move
your modem. You may have to un-install the modem physical
(meaning taking it right out of you PC) reinstalling the
video driver then reinstalling the modem (possibly in a
new slot). As far as seeing the extra monitor, check with
manufactory, they maybe able to tell you how to solve
this. With the set-up I can't suggest anything except that
some other cards I have dealt with there have been
controls that allow you to turn on and off the second
monitor.