preventing device discovery

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quarque

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Apr 30, 2010
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I have a Windows XP PC dedicated to a machine that is constantly sending data via a serial port to the PC. When we power up the system the PC will sometimes think that the serial data coming in is a "new device" and installs it as a serial mouse. When the boot process is complete the PC runs a program from the Startup folder. When this program tries to open the serial port it is blocked by the "serial mouse" it thinks is there.

We have tried many things to prevent this problem. Disabling the mouse in Device Manager works for a while but eventually XP decides there is something wrong and does things like disable the COM port. We have tried disabling the Plug N Play services using MSCONFIG. This does not seem to prevent the detection of the "serial mouse" on boot up. We have a fixed set of hardware and software for this system that will never change. So I'd like to just disable all (or serial) device discovery on boot up. How is this done on XP? Thanks.
 
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