Sorry Lottie and QVC Addict I didnt want to cause ructions!:1:.
No I was just rambling and if any of it helps then good
So you were happy with your computer until this? Is the problem that you don't have the original software for reinstalling because however bad I can't see why you could not just do a clean install otherwise? Confused why PC world have not suggested extortionate sum of money to sort it for you!
If the computer is four years old then yes unlikely worth replacing bits as usually more economical to buy system. The technology you get now for the money though is good so you can buy a perfectly good system for under £500. Depends on the screen you already have - so if you need a screen or just a base unit.