1. Note that modern computers do not require manual defragmentation. If you still want to proceed with initiating a manual defrag then continue with these instructions.
2. Open My Computer or Windows Explorer.
3. Right-click on the hard disk (usually drive C:) and select Properties.
4. Select the Tools tab.
5. Click  the Optimize button and the disk defragmenter program will open.
6. Click the Optimize button and your hard disk will be on its way to a happier life :-)
7. Depending on the size of the hard disk and how badly fragmented the process could take hours.

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