go to limewire web site
click on contact us


send an email with your username ,requesting activation of your account.give them the same email you used when you originally signed up.You should receive an email from limewire with instructions.If you purchased lime wire with a credit card,have that info ready when you email them.Usually you re-download limewire(same version),and enter a code that is emailed to you.
In other words just follow the instructions that you will receive from limewire.
When you download and pay for anything on any web site,keep a copy(print) for your records.It will save you a headache,and valuable time.