If you already tried that, since i reread your post im not sure why i asked that anyway. i would proceed from here....
Go to run and type services.msc
check for Plug and Play and see if the status is started and startup type automatic
now go to Computer right click and go to manage.
Click on device manager.
Remove the camera drivers
Restart the computer and let it rereconize the device and it may just install the software.