[Imp]

A really cheap mod that will speed it up would be to add more memory if you can still get hold of it. Old machines cant take most memory used now but I upgraded 2 by using a firm on the internet & emailing them to ask if they had it as it was not listed. They found some & gave me it free just charging for delivery.
It is important to make sure you get the right stuff that your motherboard will take & you are probably restricted to 2GB or even 1GB (I am ignoring the extra 36mb) so 2 or 4 x as much memory.
Its dead easy to fit just unplug open it up & press it into the slot, possibly pulling the old one out first & replacing. If its not seated correctly when your done computer will not boot so just reseat it. This wont cause any harm, While you are putting the memory in to avoid damage its very important you ground yourself, hold a radiator or something or better still attach yourself to it with a bit of wire