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What are they running software-wise on their PC's?
This product looks interesting if they want to centrally manage and provide a unified interface/front end if they don't already.
http://www.smartlaunch.net/webpages/
A few monitoring tools that come to mind....
Look@LAN...
Disclaimer: If you buy cheap/shoddy equipment, then you will get cheap/shoddy performance.
That being said, the only other "cheap" consumer dual-wan router I've seen is the equivalent D-Link version.
http://www.newegg.com/Product/Product.aspx?Item=N82E16833127069
However, I would spend a...
That's typically related to a Windows Automatic Updates service bug.
Have you tried booting into Safe Mode w/Networking and seeing if the symptom persists?
Round 1
In safe mode, try:
1) Start-->Run-->CMD
2) sfc /scannow to repair your OS. *have your i386 folder or XP CD handy*
3) Reboot...
First thing that comes to mind would be a script to run at logon/logoff to just do a basic copy to a network share somewhere via copy or xcopy.
Copy Zip Drive.bat
xcopy x:\ \\server\share /s /c/ /h /y /z
You could also enable offline files/folders and set it to sync on logon/off.
How to use...
So, I hear the Apple Stores are hiring.... :p
*obligatory RL friend flame*
Seriously though, it sounds like you've covered all the bases. However, here are a few additional things to check.
1) Power Supply - voltages all in spec? Running exceptionally hot? Have a spare supply you can...
m0n0wall - http://m0n0.ch/wall/
pfSense - http://www.pfsense.com
Smoothwall - http://www.smoothwall.org
ClarkConnect - http://www.clarkconnect.com
Vyatta - http://www.vyatta.com
Personally, I run m0n0 @ home and pfsense for several small work clients. Uptimes exceeding 250 days under heavy...
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Try this utility to reset the TCP stack in XP.
http://www.snapfiles.com/get/winsockxpfix.html
You could also use the netsh utility...
http://www.petri.co.il/reinstall_tcp_ip_on_windows_xp.htm
http://support.microsoft.com/kb/299357