PRW.NET FAQ's : Dialup and Modems :
Why am I getting a message reporting an "Illegal Operation" or "Page Fault" ?
A possible first step in attempting to solve this problem is to update or reinstall Internet Explorer. Since Explorer nowadays makes up a large percentage of the files in Windows, this solves the problem in a large percentage of the cases. You can download the Internet Explorer files from:
http://www.microsoft.com/ie/
If this does not solve the problem we would suggest that you contact your hardware or software vendor for assistance. Knowledge of the Windows operating system is required to fix this symptom and in extreme cases an operating system reinstallation may be required.
Note that nothing in the Internet configuration can cause an "illegal operation" or "page fault" message if your operating system and hardware are working properly. Note also that the "illegal" in the message refers to computer processes (e.g. accessing an invalid memory address) and does not imply that your system is performing any unlawful activities.
Why do I get a message about "simultaneous logins" ?