Monitor calibration

So i dont know if its a windows 7 thing or if its because i have an upgraded monitor 23'' HD but i have calibration settings that i am able to adjust. how accurate is this and is it recomended?

A hardware calibration system is "best practice" because it gives you a standardized "profile" that has the best chance of enabling color-managed software to produce images that will match prints as well as appear uniform across other color managed software/systems. The "built-in" calibration is really not geared toward photo editing. It can give "pleasing" looks but not necessarily photo-accurate.

Any so-called calibration that is based on your visual judgement, getting patches to match, is not really reliable.

windows 7 can calibrate monitors as well as printers. I've found the calibration with the printer very helpful