I think I should do that on our one remaining W7 computer. Is there an easy way for me to see if I already have the rollup update (KB3125574) or do I just have to scroll through the last couple of years worth of updates and search for it?
I have friends who have updated their Win 7 machines through the years. They applied the roll up without problem.
Strongly suggest you make a clone of your boot disk before applying the roll up. Better safe than sorry. Reinstalling from scratch can be a nightmare. Been there, got the t-shirt :)