I'm not sure really. If you look in the tutorials area, Jazz has made a topic containing what you should not put. Part of it:
3. Does your username or password have any unusual symbols such as ?$!@*-_ ect.? This can mess things up for some people. Make a new account if you're having trouble with symbols. If you make a new one, please try to stick with a-z letters, nothing capitalized.
In this case, you have played before with that username, or have you not? If you have not, then I suggest you make a new account. I'm not sure as I mentioned, to be honest.
Correct me if I'm wrong.
Hmm, like Oreo said, you can't have any strange symbols in your user/password.
Maybe it's just how it shows up on the laptop. The laptop's layout may be a bit different. Also, it could be how you downloaded FH. Really, all I think you could do would be to uninstall FH and then reinstall from this website. Also, if you ever need help getting FH back on your desktop, feel free to PM me or post here.
Murr, odd, because I have that symbol in my name, and I'm able to log in just fine. Is your keyboard on the English setting?