cleaning up fuzzy screencaps.

I'm fairly new to photoshop, and just recently have learned that sharpening doesn't always work for cleaning up fuzzy images and screencaps.
For example, on this image.

 It's really stumping me how to clean up this image, and I have read one or two tutorials as of yet that didn't achieve that clean, sharp, desired effect.
If anyone has any tips for me, or a link to a tutorial that you have memmed,  it would be such a great help.