yes all Windows systems these days come with Disk Defragment prog.
personally I hate em
the IObit Smart Defrag is ok........
I prefer the one that comes with my Paragon HDD Manager™ 2009 Pro....... it does defragging in a deep pre OS mode, where it defrags before windows boots up...... ( very cheesey way to explain it ROFL )
if you was lucky enough to download the
www.freegiveawayoftheday.com Paragon HDD Manager 2010 the other day, I recommend you use it's defrag prog instead of windows built in
some reasons why you might need to defrag:
If you install / remove alot of different programs, files, videos, music moving them around on the HD from here to there.......
do alot of video editing etc.....
this will cause you to have an HD become fragmented extremely fast...
especially if you burn alot of DVD movies or something similar.....
if your HD is not fragmented over say 5% total then it really is not worth it to defrag........ my personal opinion
sometimes cleaning up your registry will give you better improved performance alot better than defragging as well...... another personal opinion of mine
edit: turn off screensavers, or messenger programs, etc....... that will cause your Windows defrag to stop and restart all over before trying to use Windows Defrag...or you will never get thru it...............
Also, once you start your Defragging of an HD do not stop until it is completely finished..... or you could really mess things up...possibly to the point where you will have to even reformat and reinstall your OS......
always read up on system maintenance procedures before doing them, if you are unfamiliar with the way they work.....hope this helps.... Good Luck