Magic Tray is a free for personal use program which lets you play with windows and do all those nifty optimisations, you would like to try to save more space for the applications running on the desktop. It contains toggle button for all the tweaks, and to apply those tweaks is just the matter of one mouse click.
This application is another safe way of applying all these tweaks on windows as it does to involve playing with system registry at the user level. It will also show up the available RAM memory.
Some Cool Optimizations It Can Do In Windows Are: