1. Reduce your incomplete files;
Tip: Purge the Downloads Queue!
2. After opening LW wait 10 to 20 mins before using. Let it settle down 1st.
3. Don't use the Resume button on all incomplete files. This can have side-fx such as affect LW's connection quality. May queue your files for much much longer. This will also stress LW & your comp. If you use Resume/Find sources then just apply it to a couple or so at one time.
See if the above helps. Make sure your Java is up to date. I'd suggest Java 1.5 if you don't have it already. Uninstall the previous version, then downld the new version & save to your comp (don't install over the net!) Then install the Java. You can get a link from here:
Fixes for Limewire