Scan for hardware changes not working

[sb1920alk]

I'm running XP Pro SP3. This is part of preparing for a large deployment. I have three devices listed under Other devices in Device Manager. I have downloaded the drivers from the manufacturer's site and extracted them to folders. I have updated the DevicePath reg key to include these folders. If I "scan for hareware changes", the Device Manager screen blinks at me but doesn't install the drivers for these devices. If I right-click on one of them, choose Update Driver, and then choose Install the software automatically, it has no trouble finding the right driver.

How can I make it so the drivers will install automatically when I scan for hardware changes or reboot the machine?

[sb1920alk]

...if I uninstall the devices and reboot, they install correctly. I didn't try just running a scan, but I can if that helps. I'll just have to uninstall these problem devices before I capture the image.

So, is there an automated method to uninstall all "other devices" listed in Device Manager? I'd like to tack something on to the beginning of my sysprepping script so I don't have to remember one more thing.