I've had my computer for over two and a half years now and i'd like to upgrade the memory to at least 2GB. It came with 1GB and is starting to lag with some new software I'm running. Also I plan to upgrade to Vista soon and 2Gb is pretty much what you need to run it smoothly, or so i'm told. I have a few questions: How hard is it to install? What compatibility issues should I be aware of, how expensive is it and what problems might I have later on. I have never tampered with the interior of a computer so I don't want to go in all guns blazing and not have a clue what im doing. The PC is Dell with a pentium 4 3.0 GHz processor. Would i be better off just paying someone experienced to do it?