Could you make a screeshot of the window and post it here?
(Press the button "Print Screen SysRq", which is right above the Enter button of your keyboard, when the LimeWire window gets stuck). Then open MS Paint and click edit>paste. Cut the LW window out of the picture using the rectangle. Then open a new MS Paint document and go to edit>paste. Then save it as a gif or jpg file and then post here agin attaching the picture to your post.
But before, try two other things. First, close LW completely and then right click the LW icon on your desktop. Go to Properties>Compatibility and change the Compatibility Mode to Windows NT or Windows 2000. Then try to open LW again.
If that doesn't work, uninstall LW via START>Programs>LimeWire>Uninstall. Then download the installer exe for LW that you will find via this link:
http://www.limewire.com/LimeWireSoftOther
Install it and see whether that will solve the problem.....