Driver has problem on a Quad Core machine

I have a kernel driver. Testers report that the driver cannot be
loaded into memory on one particular physical machine but runs well on
others including all virtual machines.Because this machine doesn't
have com port, so far I cannot connect kernel debugger onto it. Only
this machine has a Intel Quad Core Q6600 cpu. I think maybe this is
the reason of the problem. Anyone has such experience before?

Thanks for your help.
.

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