1. Decrement your hard disk: Go to my computer, select a local disk and right click on it then click properties , Then click tools then select Defragment now. Your computer will take some time to defragment the files but it will increase some memory
2. Delete unnecessary file: When you browse internet a lot of bunch of files automatically takes memory on your computer. To delete this download a free software called Ccleaner. This software is one of my favorite and most useful. It will delete unnecessary files and will help to keep your computer run faster. To download Ccleaner go to this link http://download.cnet.com/ccleaner/
3. Uninstall unnecessary software: We often downloads some unnecessary softwares and forgets to delete them.. Uninstall them to save some free space.
4. Buy a new portable hard disk. And move your multimedia files to the portable hard disk to keep your personal computer free from burden. Nowadays portable hard disk are very cheap to purchase