I have read that if your computer gets hacked you can't be really sure that you have a clean system even if you manage to stop the hacker and the best thing to do is to reinstall your OS. Do you agree with this?
What about different types of file including audio,video,pdf and executable files. If I move them to an external drive is it enough to scan them with an antivirus? If the antivirus says that it did not find any threats, can I trust it? Is it correct at least 99%?