It helps to know

I have a computer that was purchased at least 6 years ago and I wish that I knew How to clean hard drive.

When it was new it was fast and to be honest it was used only as a video editor, as that was the business I was in back then.  As things changed and I decided that I could not maintain that business after removing the video editing software, the computer itself became my only computer and it was where I did, and continue to do all that I do using a computer.

And it has reach the point where it needs to be looked at by someone who knows what he/she is doing.