Drivers are used to help your computer communicate with a specific piece of hardware, and if the driver is flawed or outdate (both very common), the device will either not work properly, or will cause another device not to work properly. Contact the manufacturers of the various devices in your system for their most recent drivers; most are available for free download (be sure to scold the company if they try to charge you for drivers for their products).
Newer drivers can also improve performance and add new features. This is especially true of video drivers; new versions can improve speed and can increase the maximum resolution and color depth of your display. In fact, most visual problems (flicker, mouse cursor problems, and even errant font behavior) can be attributed to buggy video drivers.
Although it's a good policy to check with your manufacturer for the most recent drivers on a regular basis, you should only do so if you have the time to spend on it (new drivers may introduce new problems, as well). In other words, if it aint broke, don't fix it. See Version Control for more information.
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