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IRQ conflict with my graphics card and USB host controller

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I am having a problem. When I do anything that uses my graphics card at all, my mouse (which is a USB mouse) starts having problems. It will disconnect and reconnect, especially if I lift the mouse to move it.

I ruled out the following:

1) The mouse itself. I plugged it into my laptop and it worked swimmingly.
2) The power settings. I unchecked the box for ALL items in the Device Manager that were USB-related for "turn off automatically to conserve power."

I also tried to change the IRQ settings in the device manager, but the option to manually set IRQ stuff is grayed out.

I tried to set it in the BIOS, but I couldn't find any options to change ANY IRQ settings in the BIOS.

So I'm officially out of ideas.

So here's some information from Device Manager (I do hope it helps):

******************** SYSTEM SUMMARY ********************
Windows Version: Windows 5.1 Service Pack 3 (Build 2600)
Registered Owner: XXX
Registered Organization:
Computer Name: XXX
System BIOS Version: Nvidia - 42302e31
System BIOS Date: 12/20/06
Processor Type: x86 Family 6 Model 15 Stepping 6
Processor Vendor: GenuineIntel
Number of Processors: 2
Physical Memory: 2047 MB
******************** DISK DRIVE INFO ********************
******************** IRQ SUMMARY ********************
IRQ Usage Summary:
(ISA) 0 High precision event timer
(PCI) 5 NVIDIA nForce PCI System Management
(ISA) 8 High precision event timer
(ISA) 9 Microsoft ACPI-Compliant System
(ISA) 9 NVIDIA nForce Networking Controller
(ISA) 9 NVIDIA nForce Networking Controller #2
(ISA) 13 Numeric data processor
(ISA) 14 Primary IDE Channel
(PCI) 16 NVIDIA GeForce 8800 GTS
(PCI) 19 VIA OHCI Compliant IEEE 1394 Host Controller
(PCI) 20 Standard Enhanced PCI to USB Host Controller
(PCI) 20 NVIDIA nForce 590/570/550 Serial ATA Controller
(PCI) 21 Microsoft UAA Bus Driver for High Definition Audio
(PCI) 22 Standard OpenHCD USB Host Controller
(PCI) 22 NVIDIA nForce 590/570/550 Serial ATA Controller
(PCI) 22 NVIDIA Network Bus Enumerator
(PCI) 23 NVIDIA nForce 590/570/550 Serial ATA Controller
(PCI) 23 NVIDIA Network Bus Enumerator

Thanks! I am going a little nuts with this thing.
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