PcI-e usb 3-card not recognised, cannot find IRQ

When I start up my XP pro SP3 the Via usb extensible host controller isn't recognised.
Trying "Ad hardware" it says: could not find a free IRQ.
If I then let windows reboot, the host controller suddenly is present.
So what is the difference between normal start and reboot?

I cannot dismiss ACPI in BIOS. (American Megatrends Inc. P1.40 19-9-2011), No updates available.
 
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