I have a piece of junk laptop.

I've had it for FOUR years. Back then, it was normal to only have 33GB of internal memory. Now, it's at least what - 80GB to 250GB!?

Yeah, my laptop is old.

And messing up. A lot. It wouldn't let me on earlier after I signed off for a while before my chat. (Which I then missed as a result, grrr).

What would you recommend for a good laptop?

I'm looking for:
-Intel Duo Processor
-At least 100GB of internal memory
-14-15 inch screen
-enough processing speed to run a web-browser, iTunes and a word document simultaneously (yes, I have issues with doing this currently).

Basically I just need a laptop that isn't a metric tonne. It has to be able to run some (fairly) large programs, but I'm not doing fancy editing.

Advice?