So I will download a font no problem, copy it onto my desktop no problem, and then I run into this problem. WHen i try to put the font into my Fonts folder on my computer, I get this message "The _____.TTF file is currently being used and cannot be replaced. Wait until Windows is finished using the file, and then try again."

Can someone tell me what I'm doing wrong? Much thanks.

You probably have it opened with another program, like for instance 'Explorer'. Close all other programs, and try again.