Well I have had the problem resolved. Needed a Team Viewer session with a Topaz tech guy who discovered it was an incompatibility with a program I had previously installed on my laptop. The program was File Viewer Lite which I had installed so I could view
raw files outside of LR. The program itself was fine but the readers they use are incompatible with the readers Topaz use so it was a simple matter of uninstalling this program and now Topaz works fine. Amazing how simple the problem was but so pesky. Took ages to solve. So if anyone uses File Viewer be aware it doesn't like Topaz Plugins