Ian/Dave, thanks for your responses and investigations into this. I appreciate it.
Yorkie may also have a point, my laptop is quite old now, and has a load of rubbish files cluttering up the registry.
I will do something about it.
I will also make more use of a newer laptop that I have recently inherited from our own Dave R!
Just to be a little clearer on this screen 'freezing' issue.
What happens is, (and only when I'm using the Forum) that I can be halfway through typing a word, and the word will simply not complete. Key presses simply do not work for up to 60 seconds or so. Its very frustrating.
In fact it has happened twice while typing this post. My hardware to blame I suspect.
Thanks again all.