TIme to upgrade?

As I sit here typing my computer keeps freezing up. It is driving me crazy. Our computer is only 4 years old but this old by the standards of society today. I would love to replace the computer and should spend time reading laptop reviews but I really want to hold off as long as possible. I am in this mode of trying to milk every last dime out of my investments and I consider my computer an investment. It is interesting to see the world in this different light. It started a couple of years ago and has taken me a while to fully embrace but I now do. Owning the newest and the best is not what I need any more. All I want is for my computer to run just a little bit smoother.