You can sharpen it hun but this usually makes for a grainy image.
To be honest if its a large picture, eg from a high resolution cam, making it smaller will alleviate the fuzziness a bit....to say, 6x4 size....unless there's any specific detail you need to keep large.
I know there's more complex ways of doing this, but it depends how ''worth it'' it is....try posting the pic full size on photobucket Im sure some people will have a go for you at correcting it??

Hope this helps