Hmmm... one more suggestion
Look in Add/Remove programs, find the webcam entry and uninstall
Now check to be sure XP isn't set to block unsigned driver installs
> Rt click My Computer->Properties->Hardware
> Click Driver Signing
> Is it set to Block? In any case, suggest you set to Warn then check box to Make this action system default
> Click OK close all the windows and reboot
Now reinstall. Are you now warned that you are installing an unsigned driver? If so, click Continue
Hope this might help... otherwise, it looks like the driver i gave you should work with that h/w id.... don't know why it's not... but try the above
You might also need try unplug the device, reboot, try plugging back in after the install