It really doesn’t matter how old your home is - squeaky floors can develop at any-time for just about any reason. Some of the most common include; poor workmanship, inadequate design and improper use of materials, inadequate use of fasteners and something that may surprise you - Mother Nature herself.
The second part of the question is simple, YES you can cure them. However, how much time and effort you spend fixing them is completely up to you.
No, if you install it correctly as per instructions it will not. See video for further instruction if you are unsure on how the process works.
It shouldn’t as the screws are coated. In addition, when you position the screw in the carpet, you should use your fingers to open up the weave and position the screws directly into the joist.
Simply speaking, what needs to be done is to permanently re-attach the floor to the joist. Once you recreate the original bond, you stop the floor from moving and you eliminate the squeak.