Yes- if you delete any programs, do so through Add/Remove, do NOT go futzing about and deleting files at random in some misguided attempt to free space. If you do, you will probably learn not to do it again.
Also, How much disk space do you have? You've mentioned the amount of RAM you have as well as how much you think it should have, but both are largely irrelevant to the problem that you only have 10% free disk space.