|You posted this on the W95/98 forum but having given a detailed answer I now see that you are actually using Vista. I have therefore deleted my response because Vista is very different.|
What I believe you need is the file vnetsup.vxd (note the dot before vxd) but that's about all I can say without research.
Having had a quick Google, the hits all seem to be about W95/98. If you really meant W98 then see my response #2 here:
Ms Hulot goes horse riding