I think Birdy's suggestion was for JRE java not JDK. I'm not sure whether it makes any difference however, just JRE is for regular users & LW is expected to run using that version.

Steps 5 & 6 here for compatibility mode: Fixes for Limewire (click on blue link)

Oh just realised you are with Comcast. Do you use Comcast Anti-Spyware? If you wish to use LW, do not use it. Else it will stop LW & may even attempt to remove it from your computer, damaging it. Comcast uses a reknown spyware that is anti-p2p programs, falsely identifying them as bad when they are not.