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IRQL NOT LESS OR EQUAL software cause

I am getting the blue screen with IRQL_NOT_LESS_OR_EQUAL but only when I run a communications utility within my application (a custom vb2005 and C++ graphics manipulation program). The communications feature uses an RS232 connection to a similar program on another computer to exchange information. Lower down the blue screen it says:
*** stop: 0x0000000A (0x0000BA33,0x00000002,0x00000001,0x806E6A8E)
The computers are Winows XP, SP3.
We currently use the motherboard RS232. I'll try an adaptor. Any other suggestions?
Thanks
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ASKER

Changing Com1;s IRQ, from 04 to 03, by changing the settings selection in Device Manager, did not help. When communications was turned on it happened again. I'm attaching the minidump log.

Mini031511-01.dmp
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copying serial.sys in from the neighboring xp computer didn't help. Could the pointer to serial.sys indicate the utility using serial.sys (communications)?
I'll try reloading my main application. Then I suppose I should try a USB to serial adaptor.
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ASKER

Using a PCIE board with 2 comports has solved my problem.
Thanks all.