Strange Start-Up Problem

[Siamese Dog]

Hello everyone. I have been using LimeWire for a bout a year now and have never had any problems since the last two weeks. When i start up limewire it seems fine, loads the skin blah blah blah, then when it gets to the window where it asks you if yoiu want to upgrade it just freezes. I move my mouse over any of the three buttons and they change the colour slightly like it always has. This shows me that the limewire hasn't frozen cmpletly but i just canot press a button. When i press 'No' or 'Yes' or 'Why', nothing happens. The window just stays there and i cannot get out unless i do Ctrl+Alt+Del then end process....has anyone ever had this problem? Please help me....thanks in advanced....Landon Smith