Hi Stuart, You know you are probably right.
I have used Norton since it first started I think. I have never had any problems with it. However in November 2013 I upgraded and I had a few problems in doing so which rather threw me at the time. However this new Norton is a lot more aggressive and even has a deep cleaning program for the first time, it is quite mild though. I had carried out several other driver/bios upgrades at the same time. However I started to get random screen freezes. I rolled back everything and searched high and low but did not check Norton for some strange reason. I could not find the problem.
I though it was the fan in the end and decided to replace it and at the same time stick in extra RAM and an SSD as my main drive and move the current main drive to my second slot. Part of the exercise was to re-install Win 7 , my laptop was getting a little slow. I play World of Tanks with the Grandchildren and at 71 playing a 16 year old I need all the speed I can get. During the process I decided I now did not need Win 7 Ready Boost. So I tried to format SD Card to discoverer that Norton was not allowing the installation of the Driver, It was also not allowing me to upgrade Family tree Maker program either. I fixed both problems but it has certainly broken my trust in Norton.
Thanks for your input.
David