Trying to delete trial version games

[Penny]

Ok, I just got my 6700 from another person and they had trial versions of some games loaded that are out of date. I wanted to delete them to free up space so I went to remove programs and they are not there. Only a few things were there. I noticed that in the memory it says that most of the memory is being taken up under program space. How do I get to this and how do I delete stuff from it. Forgive me if it is posted some where I just can't seem to find it as of right now.

Thanks