Hardware driver updates can be a blessing and a curse. When they're good, they can fix bugs, improve performance, and add new capabilities, giving your PC a minor upgrade without requiring any extra effort or investment. When they're bad, they can make a once-reliable PC slower and unstable, handing you a one-way ticket to blue screen town (or whatever color the Windows error screen is these days).
While gamers and other enthusiasts may be in the habit of downloading and installing new driver updates for their systems, most PC users just let Windows Update handle driver installation and updates. PC manufacturers can submit their own tested and validated versions of drivers for distribution via Windows Update, which (at least in theory) should maximize stability and minimize problems.
But mistakes happen, and sometimes a driver update is distributed that causes more problems than it fixes. Normally when this happens, the company either needs to submit an updated fixed driver to Windows Update, or the user is on the hook for either rolling back the update or finding and downloading a better driver themselves.
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Source: Ars Technica
