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Defragmenting your hard disk is a great way to improve the performance of your computer. You spend your days adding, editing and deleting files from your hard but unfortunately, this process is not always done very efficiently. For example, when you delete a number of little files and add a new large file, the file may get broken up into multiple sections on the hard disk. The computer will still read the newly added file as a single valid file, but the drive will have to scan multiple parts of the disk to read it. Because hard disk seek time is one of the most significant bottlenecks in a computer's performance, this can drag down your computer's speed quite a bit. If you have a lot of "fragmented" files on your hard disk, you might hear extra grinding, sputtering, and other weird noises coming from your computer as it searches around for all the bits of the file. By defragmenting, files are rewritten to the disk in contiguous clusters thus speeding up data retrieval and thus speeding up your computer!
Click Start -> Click All Programs -> Click Accessories -> Click System Tools -> Click Disk Defragmenter -> Click Analyze
If it says you should defrag -> Then click Defragment -> when it's finished -> Click close then the X in the top right corner
If it says you shouldn't -> Click close then the X in the top right corner