A bit of computer advice please. I have a problem on my PC which means that when I am typing a document (in any programme) the cursor randomly moves itself to a different part of the document. So unless I am looking at the screen, I type over something I have already written. It's happened on and on every since I bought the damned computer, but today it' s happening every thirty seconds or so.
Any idea why this is happening and what I can do about it?