No mention of Java version. You need Java 1.5 or later. Install java using the Offline instaler. Try removing all Java versions & reinstall java using OFFLINE installer
Download Java software from Sun Microsystems
You previously used LW, which version?
Run this small utility:
Crap Cleaner
Try deleting your LW Preferences folder whilst LW is
closed; instructions here:
Point #2 & 3 in Fixes for Limewire (sample image included at bottom of page.)
Oops I missed the bit about first time on this computer.
Also try the step about Admin. in the above link.