This is what inevitably happens to every computer running the Microsoft
Windows family of operating systems. Once your computer has been running for a while, the registry and filesystem gets so full of useless
junk from old programs and bloatware, that it slows the whole system down. After you'
ve defragged a million times and cleaned up everything imaginable, you still can't get your computer back to the way it was when you first installed
Windows. The only cure is to reinstall a fresh copy of the operating system. That will keep you going for at least another 3 months.