Its to get you up and running without need of an internet connection (which is not always possible right away). It is impossible for any mfg'er to keep drivers on the CD updated retroactively so while they use the latest for a cd of a given batch/run/etc... not all kit is sold as soon as its made. Thus the drivers are usually outdated, BUT it gives you a starting point.
Well, you could just ask him and send him a PM, his name here is linus Or I can give you the answer. The reason why he tell you that it's because the manufacturer always include crap software and other crap in their driver. the driver from the head company ( Nvidia ati etc ) are clean and the best working since they are clean. This is why
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