I had a problem with this update KB 3001554. After update, Foxfire crash, could not access internet, windows would freeze. Same with chrome. My Icons didn't work could not open my programs or it was sooo slow took sometimes minutes. In short my computer was behaving badly. I scan for spyware using Super-Anti spyware and Malwarebytes - Anti Malaware and these programs was very very slow not normal not fast at all. I decide do restore system and it took two times first try fail second time error says it was not complete however it did restore the windows to earlier date. My avast anti-virus was turn off and I could not fix it. I was told to reinstall it which I did and it work. I note the update was ready to install on my computer I decide to go on internet to see if anyone had this problem with this update and indeed their were some complaints. So I conclude this update cause all this problem on my computer. I went to windows update click on hide this update so it will not install on my computer. Now my computer is doing fine. It took many hours to reslove this problem and I do hope I can spare others from this.