1 .Let your PC boot up completely before opening any applications. 2 .Refresh the desktop after closing any application. This will remove any unused files from 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 uses up 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. ...