Defragmenting your disk can take some time (several hours even on a fast PC), and you cannot use your PC during this time. It's advised that you leave your PC defragmenting over night.

• Close down all applications and disable your virus scanner if possible. Also switch turn off any screensavers that you have.
• Click Start and then Programs->Accessories->System Tools->Disk Defragmenter
• Disk Defragmentor will start. In the top half of the window you will see a list of your harddisks, you may only have one. If you have several you will need to defragment each drive. Click on the drive that you wish to defragment and click Analyse.
• After a few seconds you will be told if you need to defragment your disk or not. If you do wish to defragment your harddisk then click Defragment. Do not use your computer while it is defragmenting.
• After some hours defragmentation will be complete. The graphical representation of your harddisk should look more healthy with little or no red blocks. You may now quit Disk Defragmentor or defragment another disk.