The fact that you're not able to get your USB keyboard to access BIOS is a bad sign - it's looking more and more like hardware failure rather than a driver issue. A screenshot of device manager from the bad PC would be helpful.
Also XP builds for both PC's (XP version/32bit/64bit/service pack etc.)
Both good and bad pc's have the same OS: Windows XP Pro, SP2, Version 5.1.2600,bottom right of post, next to post reply, upload a file and more options,
Build 2600. Both pc's have a c:\windows\system32 folder, so I assume both are 32 bit systems.
Please see the NOTE on both pages of the uploaded file.
Oops! I thought you had only asked for shots of the good pc's device manager. Okay, I try to get that to you, but when i opened those USB folders I don't remember seeing anything saying unknown devices; everything seems to be "working properly". So I guess next step is to run that Linux app.Process of elimination. Your PC symptoms point to either hardware or software failure. If it's a hardware failure you are wasting your time trying to install drivers. At the minimum device manager in the bad PC should show a bunch of unknown devices where the drivers were missing (you didn't include screenshot of bad PC's device manager so I'm left scratching my head).
BUT IF it looks like dead USB hardware how easy to transfer files between pcs using that crossover cable?
Is the GUI as user friendly as Windows Explorer?