Windows Protection Error

Given so little info, it could be many things, but a Windows Protection Error usually happens when a program attempts to use memory outside of its assigned space. This happens when an executable file is corrupted by something, or is simply not written correctly. Internet Explorer used to be a major source of problems of this kind, but recent releases have largely solved the problem.

Since this occurs when connecting to the ISP, I would first suspect the browser program, then the networkingsoftware. Try uninstalling the browser and reinstalling from the original media. If this doesn't restore normal behavior, remove all networking components and re-install them. Without more detailed info, it's impossible to be more specific...

Reads as though it is a hardware problem,which does not mean that it is there could be corrupt files or the modem needs updated drivers.
go to Start>Settings>Control Panel,and open Modems.On the Modem Properties dialog box's General tab,highlight the modem and click Properties and in the Maximum speed dropdown list selct a different settings to see if this will help,a higher speed may help

You have provided too less info; so please use the following link to get more info on your problem:
How to Troubleshoot Windows Protection Error Messages

http://support.microsoft.com/support/kb/articles/Q149/9/62.asp?LN=EN-US&SD=gn&FR=0&qry=Windows%20Protection%20Error&rnk=4&src=DHCS_MSPSS_gn_SRCH&SPR=W98

Plus, if it occurs when you are using a new device; then the initialization process may be the source of problems.

Check the protocol stack. This gets activated when you get a connect. If something is corrupted, it would explain the crash.

Also, try turning on logging on that modem and see what you get.

Good luck.

reload windows

there is no problem with the modem or by an asp