Downloading graphics driver installer from Intel website will run without administrator privileges, and hence the installation will fail.
In order to run it correctly the user should right click "Run As Admin".
I suggest forcing the installer to run as Administrator (UAC prompt).
When installing video drivers UAC will always prompt you for permission to install the driver, however this should not avoid the driver installation once you give permission to the installer. Even though you hit, run as admin, the AUC will prompt you.
There might be security settings in your system that may prevent the installation of the driver unless you run it as admin. I suggest you check with your system administrator for information on this.