Illegal Operation Window

Whenever my computer sits idle for a short period of time I receive a illegal window notice called "Explorer".  It says, "This program has performed an illegal operation and will be shut down".  When I click on (details) it says, "EXPLORER caused an exception 6d007fH in module WEBCHECK.DLL".  Does anyone know what's causing this "Explorer" illegal operation window to appear and/or what I can do to fix it?  
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Not sure whats causing the error, how to decipher it's terminology but do know that you don't need it to run in idle. It has probably been set to start on starting the computer! It has something to do with checking the Web and if your idle and not on the web you don't necessarily need it running, be careful though if you have an automatic connection to the web or are suppose to have it on all the time when the computers on for quick access. It's a web site monitor according to my specs and it's location is C:\WINDOWS\SYSTEM! The version number I have is 5.50.4522.1800 and it is from Microsoft. If you find that you don't need it to be running while your in an idle state you can turn it off from starting in your MSCONFIG Window by finding it or a program using it in your startup command file!   AL

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You might try extracting webcheck.dll from the win98 cabs of from your win98 cdrom.  From the run prompt type sfc, hit ok, select extract one file.  You can extract it from c:\windows\options\cabs.  I would suggest making a backup file in the directory it case you want to go back to the previous version you were using.
The file should be placed in c:\windows\system
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