The apps fine, the download page is not:
https://habbox.com/#!/HabboxLiveDesktopApp
This is not very realistic of a PC to be honest and wasn't very funny (Also why in the **** is it a CRT?). Windows BSODs have'nt been that unhelpful in information since Win95. If you do not superimpose the Windows 8 BSOD image onto the screen I will be very sad:
Oh and major fyi it should be labelled as a "Windows" download, not a PC download, Linux and Unix running machines are PCs too but they don't really run executables without help.
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On a more serious note, when the App is "hidden" double clicking in the tray should make it appear again, the requests bit uses a pretty sans-serif font like verdana or trebuchet for the habbo name bit but courier new for the message bit, no reason for a different font really. Also the dimensions on it are all set to percentages, set the button, name area and drop down to fixed height and give just the message box fluid height. The buttons in the "main" view could do with some habbo-fying by the graphics dept. also.