1. Let your PC boot up completely before opening any applications.
 2. Refresh the desktop after closing any application. This will remove any unused filesfrom the RAM.
 
 3. Do not set very large file size images as your wallpaper. Do not 
keep a wallpaper at all if your PC is low on RAM (less than 64 MB).
 
 4. Do not clutter your Desktop with a lot of shortcuts. Each shortcut on the desktop usesup to 500 bytes of RAM
 
 5. Empty the recycle bin regularly. The files are not really deleted from your hard drive until you empty the recycle bin.
 
 6. Delete the temporary internet files regularly.
 
 7. Defragment your hard drive once every two months. This will free up a
 lot of space on your hard drive and rearrange the files so that your 
applications run faster.
 
 8. Always make two partitions in your 
hard drive. Install all large Softwares (like PSP, Photoshop, 3DS Max 
etc) in the second partition. Windows uses all the available empty space
 in C drive as virtual memory when your Computer RAM is full. Keep the C
 Drive as empty as possible.
 
 9. When installing new Softwares 
disable theoption of having a tray icon. The tray icons use up available
 RAM, and also slow down the booting of your PC. Also disable the option
 of starting the application automatically when the PC boots. You can 
disable these options later on also from the Tools or preferences menu 
in your application.
 
 10. Protect your PC from dust. Dust causes
 the CPU cooling fan to jam and slow down thereby gradually heating your
 CPU and affecting the processing speed. Use compressed air to blow out 
any dust from the CPU. Never use vacuum.
 RAM IS THE WORKING AREA (DESKTOP) OF THE CPU, KEEP IT AS EMPTY AND UNCLUTTERED AS POSSIBLE!