A few days ago I was instructed via Windows Msgr that I needed to download an important UPDATE: NVIDIA Graphics Driver.
The download indicated the installation was successful and that I needed to restart the computer, which I did. However, what I see as a result isn't to my liking...
Everything appears to be broader...
Is this driver update necessary for a smooth operational system between Windows Vista, Internet Explorer, and HP software?
Or can I restore choose to "restore" it to a previous version by using the Driver tab and Roll Back Driver under the Device Manager?
Please explain what NVIDIA is and how this "so called important update" is important? 
Any information would be appreciated.