I think the size is either due to graphic card settings or system font settings.
1. Uninstall all versions of Java using your add/remove control panel then reinstall using the "Offline" Java installer:
Download Java software from Sun Microsystems
2. Try options listed here
Fixes for Limewire
3. If still no good, please supply us a few more details:
System details - help us to help you (click on blue link)