Things won't go pear-shaped, scottiesmum............if you don't use any programs that require it, then you don't need it. If you do use such programs and it/they are running ok now without this update........then if it aint broke, don't fix it.
It is a huge download for something that you don't need and which may, indeed, upset the applecart if installed. Lots of problems posted around the interwebbie about this update.
I don't have NET Framework installed, and have never missed it.
I would forget it............and good for you for putting a curb on the auto updates, always good to know in advance what Windows is trying to do.