Just see how you go with the cleaning it might sort your problems.
There are a few programs that will test your ram, this is one, I've not used it just did a Google for it
http://www.memtest86.com and also I seem to remember Norton did one too.
Also if you do need to buy anything for your computer try CCL in Bradford probably not far from you as it's Leeds side in Tong have a look at their site
www.cclcomputers.co.uk they are cheap
