PrivaZer,When you use your PC (at home or working at your office), go on the Internet, watch a video, download, copy/remove files on your PC, install/uninstall or use software, etc., you always leave sensitive traces which:
make your PC slower and cluttered?
reduces free space available and ?
puts you at risk for a bad consequence: what you have done could be easily recovered by analyzing your PC with an expert recovery software or with more advanced techniques.