Support for Windows Vista officially ended on 11th April 2017. If your computer is still running Windows Vista your computer is most likely 6 or more years old and more than likely to have a hard disc drive...
If you have children (or grandchildren) that you occasionally let play educational apps/games on an iPhone or iPad, then there is a built-in setting to stop them accidentally (or purposely) getting out of that app/game and accessing other applications...
7 Reasons why your Macbook or Mac will not start or is stuck on the startup screen Without putting the Mac or Macbook through an Apple Diagnostics test, it is impossible to say if you are experiencing one...