USB Ports and AGP Video Card on same IRQ

I've got a tough one. I have 6 USB ports. Call them 1,2,3,4,5,6. Ports 1 and 2 work fine with my new USB 2.0 80GB External Harddrive. This pair of ports 1 and 2 are direct into motherboard.
However system crashes when I plug USB 2.0 External Drive into ports 3,4,5,6. These are Dports with cables that plug into the MB. One of these Dports has the four error lights which are all green. Western Digital has cautioned against sharing this drive with other IRQs. Says that the video card and the WD harddrive require dedicated IRQs...but I have no control of how W XP assigns them.
Ports #3-6 work fine with mouse, scanner, and printer etc. However they fail when trying to use WD External Hardrive.
I also checked IRQ settings and IRQ 16 is used for a USB Port and for my MSI AGP video card. I believe this conflict is the cause of the problem.
So help..how do I fix this dilemma?
I have Windows XP and see no way to change IRQs.
BIOS does not even show IRQ as a choice..only 1-15. Also BIOS is latests version for my MSI 845G Max L MS-6580 mother Board. USB drivers are all Intel. Video Card Is MSI AGP MS-8878 G4Ti/MX 420 w TV out. Bios and Drivers are current.
How can I run the USB 2.0 External Harddrive in Ports 3-6?

I did load new Intel INF Drivers and AGP drivers yesterday.
No luck USB Ports 3-6 still fail with External Hard Drive.
I'm not clear on how to turn back on AICP or ACIP. BIOS?
Also not IRQs 16-23 are listed with active devices on the Device Manager
16 has a USB Controller at 24c2
16 also has AGP video card
17 has Audio '97
17 also has Fast Eternet.
18 has USB Controller at 24c7
19 has USB Controller at 24c4
23 has PCI to USB Interface.
Port 3-6 do work fine with mouse, dig cam, Scanner, printer. These ports only fail with External Harddrive plugged in. Ports 1and2 work fine with external HD??
So question is how do I check on the IRQ ports using AIPC or APIC...or whatever the name is...thanks folks.

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www.hp.com/contacthp/
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