Does your computer freeze? If yes, then you may be in need of a java update: http://www.java.com/en/download/windows_automatic.jsp But if it doesn't freeze, then you may just need to urge the dwnlds on a bit.

Do another search for more sources. Search results go stale after a certain amount of time. Some days, LW needs just that bit of baby-sitting. If it stops, delete it from the dwnld list & re-select to dwnld from the search results. If it doesn't start dwnlding, do another search.