No your computer isn't too old but it needs more memory - as you have found out. As I haven't heard of your PC (and you don't say if its a desktop, tower, or laptop) its difficult to say what kind of RAM modules you need. However here are some tips. There are normally two slots for RAM on a PC your may have one in use or both - you need to look. (Do a search on the web for pictures of what they look like.) Some PCs require you to fit RAM in pairs others don't. Many of web sites that sell RM have 'configurators' which will help you choose the right RAM modules and whether you need a pair.
My advice is, if your PC can take it, buy one 512MByte SD RAM module and the increase in your PC's speed will amaze you.
t
March 2007