JonBoh
There does seem to be a conflict with a 'High Definition Audio Controller' and a 'USB Universal host controller'.
How do you go about changing assignments in Windows 7? People seem to think you can't do it in Windows 7 because it is system managed by ACPI. I don't know if they are right or not...
Typically this isn't something you can sort out in Windows itself, as jrmunday mentioned, you'll likely need to access your motherboard's BIOS looking for its more advanced options.
You can try simply disabling the On-Board Soundcard from within Windows (or shut it off more directly in the system BIOS) to see if that helps in some way, and it may
but you'll also find that Windows will end up using the next device it finds for Windows Event sounds.
This in itself, however, can sometimes cause a whole other set of issues with your Pro Audio Card's Clock or even recording frequencies to be suddenly changed if Windows throws up a system sound while you're recording.
As far as trying to go the BIOS route in attempting to move the Universal Serial Bus to another non-conflicting IRQ (which is sometimes impossible), you'll first need to find out if it'll even allow you to access and modify these settings...
For instance many MB's are controlled by the popular Award BIOS and some iterations of this BIOS contain options such as what you see below. You'll need to find out if your BIOS allows for similar actions to be taken.
If you are able to change these parameters within your BIOS, then you can set, for instance, the Resources Controlled By to Manual; allowing you to tweak IRQ Assignments with greater scrutiny.