Yup, if it ain't broke don't fix it.
There's no way to fix the IRQ assignment of onboard hardware without re-installing Windows without ACPI...You just don't want to go there. 
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*Disclaimer: If this thread, or a link within this thread leads you to follow advice that crashes/explodes/burns down or any way damages your system or causes personal stress or hardship, I am in no way responsible for any problems.*
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