Dial up connection error 601

I have a dial up connection. I cant solve an error. I am using windows 98 because my performance is very low. I have been using this connection a very long time and this is the first time that i face this kind of problems. I am trying to explain it but no ideas about how to explain it to you guys. When i try to work using VPN dial up connection this error occur.
Windows dun/rss error 601
"The port handle is invalid."
Now tell me what to do to fix this problem. advance
Thanks
