Hi Steve, thanks for your input and suggestions. I use the touch pad on my laptop. I use another forum, which works in a similar way to this PC one, and I don't have problems with the sliding bar jumping about when I'm on that site! I've got the T.V. on whilst operating the laptop, but I can't see that my problem is due to electrical interference from that, as I often do have the telly on whilst operating the laptop (we girls are good at multi-tasking) It's not caused any problems before. I have an additional problem this evening in that ABP isn't working either, just to add to the irritations!