I can't afford a laptop

You might want to check this out:
http://schools.hardsoftcomputers.co.uk/

Not sure if they do computers for just one person but prices are very cheap and might be worth a look

Have you asked anybody at your university? They might be able to lend you one for the duration of your course or something?

I could sell you my old one for £50 if you like? its worth approx. £150 but as im working 33 hours a week on top of uni id rather give it to someone who needs it for less as im not as hard up on funds as you. its a Samsung with 2.9ghz amd processor and 6gb ram I think its this model but ill have to get back home to check first. its not in amazing condition but it works fine for word docs/internet etc http://www.amazon.co.uk/Samsung-355V5C-15-6-inch-Laptop-Silver/dp/B009SJCW3C/ref=sr_1_16?s=computers&ie=UTF8&qid=1450178328&sr=1-16