Here's a great resource for your motherboard:
http://www.viahardware.com/faq/kg7kr7/kg7kr7faq.htm
Definately give that a read. Really good information there.
As far as your having a ton of devices on IRQ 7 in Win2K, that is ACPI at work as I mentioned earlier. How are your devices laid out on your PCI bus? Here's mine as an example:
AGP Slot: Geforce2 GTS
PCI Slot 1: Empty
PCI Slot 2: Empty
PCI Slot 3: SB Live
PCI Slot 4: DVD Decoder Card
PCI Slot 5: Network Card
PCI Slot 6: Empty
What extra devices do you have enabled like USB, Highpoint RAID Controller, etc.?
You might want to check out the bottom of this page:
http://www.viahardware.com/faq/kg7kr7/installation.htm
Which has suggestions on how to lay out your PCI devices, it also explains how to avoid address line sharing. Pay close attention to this diagram:
1. "INT Pin 1": AGP card and PCI Slot 1
2. "INT Pin 2": PCI Slot 2 and PCI Slot 3 and ACPI (if enabled)
3. "INT Pin 3": PCI Slot 5 (and HPT370 controller in KT7-RAID)
4. "INT Pin 4": PCI Slot 4 and PCI Slot 6 and USB
That tells you what is on each of the address lines. Be aware that GeForce cards don't like to share the address line and Soundblasters and NICs don't get along very well on the same address line. So don't stick your soundblaster (if you have one) in slot 2 then put a NIC in slot 3.
Of course, your problem might not be related to your PCI devices at all. Do you have the latest drivers installed? What about the latest VIA 4-in-1 driver? Do other games work or other intesive programs? Or is it just multiplayer games? Do you have the latest DirectX version installed?
Instability problems like this are a real pain to track down. But just keep at it. We'll find it eventually.
Being right doesn't matter if no one listens.