I have a laptop with WIndows Vista, but only 512 MB of RAM. (Bought it about 18 months ago.) My patience with its slow performance has become rather strained. I'd like to upgrade the RAM, but don't want to do it myself. Any recommendations for companies/people in central London, or Wimbledon/Kingston area, that could do this? Any ideas of cost? Also, if I'm likely to buy a new laptop in next 12 months or so, is there much point in going beyond 1 GB of RAM? Only use it for e-mail, internet, & Microsoft Office applications, nothing too demanding. Thanks in advance, and apologies for my ignorance of these subjects.