Well the drivers on the disc are useless for the most part. The only reason why I install the drivers from the CD and then go to the internet is because of the tremendous amount of video lag that sometimes occurs if you try to operate the computer without the drivers installed. So really, the only reason why I install the CD drivers first is so I can smoothly navigate to the website and get the newer ones. I'm very impatient. Lol.
And I referred Driver Sweeper to prevent any issues with previous drivers. Even after you install new drivers, the old driver settings and folders are still kept on the computer. If both are still present, its possible for the computer to still try and access the older ones, thus creating a lag spike during game play. It's happened to me before in the past and that's how I came to know DS (Driver Sweeper).
-Charles