it does this to me when i try and preview using limewire!

you may not need any codecs! try this;

close limewire down go to your incomplete folder, usually c:\documents and settings\yourname\incomplete...

Select the file you wish to preview. (right click, then open with and select media player or similar).. it should now work..
if its ok, exit out and reopen limewire...

please note, when clicking on the x in the limewire window, all this usually does is minimise, make sure you exit using your taskbar! and dont worry when you reopen limewire your downloads will continue from where you left off!

hope this works!