Paul:       
I have a similar problem with my computer too.  If I'm using the LAN modem to connect to the Internet my Microsoft optical mouse will not function if I connect using a USB connection.  It works fine using the PS2 port.  If I'm using the mouse, without connecting to the Internet, on the USB connection it works just fine.  This problem started after my hard drive was formatted and Windows 98SE was loaded.  Previously, I'd been using Windows 98.  I believe that these hardware items are in conflict with each other, but, I'm too computer illiterate  to know what to do about it.  I believe these items are both trying to use the same IRQ to function. (IRQ 9).  I think this would be a 'piece of cake' for someone to fix if they had just a bit more computer sense than I have.  In the meantime I'll just keep using the PS2 port for my mouse.

Joe Horley

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