Suddenly my daughter's computer will not let her go on line. The following error message is posted:

"ERROR 745: An essential file is missing. Reinstall the Dial-up Networking files."

I tried reinstalling netscape but without any change in reuslt. The modum works because I am able to send a fax. Are the dial-up files in Windows 98? iF SO, how do I identify just them without overwriting my devise drivers?