Are you running as an administrator? If not, do that (right click on the LW icon & choose to run as admin).
Which version of LW was up & running, before you got stuck at 12%? Have you installed any other software since then?

Do you have AllChars installed? If you do, disable or remove AllChars & see how that goes.

Which version of LW are you using now? Go here & download an older version...see whether that loads without any problems.
Old Version of Limewire Download

If you're using 4.16 now, try a 4.14 from that site, or a 4.12. If you're using a 4.14, try a 4.12 or the latest 4.16 from the official site below.
Lime Wire » Official Website & Free Download, BitTorrent «