Hey ever wondered whether you can just remove a file rather than put it into the recycle bin? You know you delete a file and it goes to the recycle bin, then you can retrieve it if you suddenly remember that you needed it. To bypass the recycle bin and remove files totally, highlight and hold down shift+delete.
When you have deleted a lot of files, it is always a good idea to do a defrag as this speeds up your PC and extends the life of your Hard drive.