A small village in Eastern Poland. A customer of ours complained that his computer, 12 years old, is very slow. I can't help – I'm not good at cleaning windows (my wife will confirm). But, I say, you could try Linux.
Yesterday I ran Ubuntu live from a USB stick on his computer. Today he said he's very happy with it, so I'll install it. His Windows will stay for a while as I expect a long struggle with cups.