Are you sure that you are installing them, does it say something like inisializing? if not, what I have to do it, make 2 windows, on with the font you downloaded on it and another with the fonts, and resize them so that they are small. then I drag the downloaded font to the desktop, then I drag it from the desktop to the font files. For some reason, I can't move it directly from the 2 spots. The you can delete the one on you desktop, the font will still work. Is this making sense, I think a worded it a little weird.
I download the font >>>>Extract All Files >>>>Open Up My Fonts Folder while keeping the extracted files open >>>>Copy the d/l font file >>>>paste it into my fonts folder >>>>and it then installys and it takes.......10secs, tops.