The RAM and XP question

[Beskar]

RAM is so cheap now-a-days, and it is a significant upgrade over your current. You would only be looking at around £30 for two sticks of 2gig each (total of 4) possibly even get it for less depending on your personal circumstances and in my opinion, it makes a very clear and noticeable difference.

With my current budget and situation, paying the amount for the RAM will not be breaking any banks, however, I don't know about your situation and if money is very tight, then it might be best skipping it.

The best way to think about it would be like this. "If I simply lost £30 at this moment, how negative an impact will it have on my life?".

I would recommend assuming the worst case, then deciding on that. If it ends up better then that, you will feel really good about it.