When trying to manually update a video card driver you get the result:
"An error occurred during the installation of the device. Access is denied."
Resolution:
Open regedit and navigate to:
hkcr\igfx.cuiservice.1\clsid
Edit permissions to as follows:
administrators - full control
system - full control but check the box for deny "set value"
If this does not work, use processmon to monitor access denied results that occur in the registry during installation and set the same permissions as instructed above.
submitted by David P. Rowe