installing device drivers manually?  

Hello there
I know that most updates can be installed manually by issuing the command pkgmgr /ip /m:filename.cab.
In the recommended updates section, there are 2 updated drivers for my soundcard and video card.
if I download the cab file manually and try to install it using this method, it won't work.
Next I tried extracting the cab file using winrar and installing the driver via the device manager. The driver installed correctly, but when I next went to check for updates, it still showed the driver in the list of optional updates.
Is there a correct way of installing the driver manually?
Thanks.

I do it like this, because I want to be able to download the drivers from windows update for later offline installation.

Can't you accomplish the same by setting WU to Notify? You can note down the updates to download later and let Windows do the updates.