Windows usually includes a basic driver that will enable basic functionality.. no control panel settings, mixers, configuration, etc. hdaudio.sys is a generic driver for HD Audio sound cards. IMHO you should keep the proper Realtek driver from Toshiba or from Realtek's website. As for the display driver, the drivers you get from Windows Update (or Microsoft Update Catalog) are full drivers, but drivers from the catalog don't always include an installer (has to be installed through Device Manager or done for you thru Windows Update ). You just got a newer version than Toshiba posted. My OEM (HP) stopped posting drivers updates for my laptop a long time ago, I get updated drivers from Windows Update/Microsoft Update Catalog, they are the exact same in functionality. Microsoft didn't make the drivers, the respective manufacturer did, they are distributed through Toshiba's website or Windows Update.