Error while driver installation

Hi all!

I've some weird problem.
I have a USB PC Camera-4 (SN9C120) and a driver for it. When I try to
install the drivers from the disk the drivers are installed but the
camera still is with a yellow mark on it in device manager and doesn't
work. When I try to update the driver and point the update process to
the inf file of the driver it starts to copy the necessary files to
system32\drivers folde but fails on ks.sys file and finalizes the
updating of the driver with error message which says:
There was a problem installing this hardware:
HP Basic Starter Camera
An error occurred during the installation of the device
The data is invalid.

I already tried to rename a current ks.sys in system32\drivers folder.
It didn't change the result.

Any help greatly appreciated!
Ilya