Laptop Malfunction

Dilemma - do I buy a new laptop? It's five years old, the CD / DVD is slightly faulty, the mouse does not work so we are using an external mouse, the letters and numbers have worn off the keys (a,e,o,l,m,n) and while they have been rewritten using tippex and then covered with clear nail varnish - there is a limit to how mant times this can be done. Finally the backspace button and enter button are no longer working following a spillage of tea - this is making life very difficult!! I have managed a morning at work with all these handicaps - in the interest of the environment do I struggle on or do I succumb and buy a new one?