You pretty much hit the nail on the head.
Windows doesn't need drivers to detect Plug and Play hardware. And your problem seems to be the webcam hardware is no longer detected!
You might double check BIOS. Make sure there's no option that it's disabled there (Disabled in BIOS would prevent h/w detection)
But we can also double check a couple things
1. List any Problem Devices
- Make sure devices are connected and powered on
- Click Start->Run, enter: msinfo32. Click the + sign next to Components to expand it
- Click Problem Devices. Anything appear?
- If yes, click on it, Ctrl-A to select all, Ctrl-C to copy it, Ctrl-V to paste into next post
- On the other hand, if no devices are listed, tell me so
2. Let's see what device/driver data is still loaded into Windows. See [post=939115]How To Report Your Computer's Device Manager Data[/post]
/* EDIT */
btw... Your webcam will almost certainly be a USB enumerated device (it's Hardware ID will begin
USB\ ). I'd also venture to guess those Base System devices you saw were
PCI\ devices?