Many thanks Ady4um, I did remove all remnants of Avast the last time. The folders I have now are because I did a system restore. I was unsure whether they would affect my reinstall of Avast but have deleted them and have had no problem. Being an inquisitive soul I will probably try installing the new one again at some point and maybe untick a load of the scanning settings just to see if it loads or not. There are quite a few changes in the changelog, so I will wait until I’ve a couple of days then try and disable what I can and see if it will load at all. If I can get it to load o.k. then I can tick relevant parts one at a time until I find the culprit. I probably won’t have a chance to do this for a few weeks as working a lot, but will post under a fresh heading of some sort should I find the reason. Again, many thanks and have a good day.