Thanks for your help Rattle and Zero, I have found that switching the trackpad off with he keyboard (Fn F10) gives the best result. There is still an occasional glitch using a mouse. I suspect the machine has picked up a virus or similar nasty. I had a word with the local independent computer repair shop owner this morning and he suggested turning off the pad. If things do not improve (no chance of that) he has said the next step is Safe mode, In which case he will be fixing it.
Last edited by: Old Navy on Mon 28 Oct 13 at 14:49
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