For starters, are you trying to download basic (free) or Pro ($US!18.88)?
If you've never used LW before, start with the free basic & when you know your way around it, then think about getting Pro

If you're downloading basic, you don't have to enter any info at all. Just go to www.limewire.com & download from there. If you're downloading it from some other site... please don't. You don't know what you're getting. Could be an old version, might have some adware/spyware, you just never know. Stick to downloading from the official site & you'll always get the latest, clean version