I had that same machine 4 computers ago. I loved it. When it came out, it was the ragged edge and, with it, AMD put a hurtin' on Intel. You have more than gotten your money's worth out of it.
With a hard drive that small, there isn't a whole lot we can do with it. It is currently loaded to the gills with only 78MB of free space. As a result, the speed is being hampered by the load. We will attempt to clean it up a bit here.
As for adding more security programs, your HD just doesen't have the room.
All of the other suggestions made by PC Pitstop about adding to this machine would be a waste of time and $$. So don't do any of them.
As it sits, there is no evidence of any worms or viruses and that is good.
All you can really do is use Ace Utilities to cleanup the hard drive. That will speed things up considerably.
Install it and when you get to the menu page, click on Wizard. Enable all 4 options and run the program. When it finishes dump everything it finds. Trust it totally as it will not hurt you.
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