You will not free up much space putting a few programs in the recycle bin.
The things that REALLY take up space are video and movie files.
If you have any videos or movies either back them up to CD or DVD, or delete them if you dont want them.
Make sure you clear out your recycle bin as while files are still in there they are taking up space.
The other option is to buy an external hard drive.
It plugs into your USB port and is very easy to use.
You can move files to the external drive and that will free up space on your hard disk.