I purchased limewire pro two days ago for mydaughter,I paid $18.88 with a credit card,worked fine for about twelve hours! When you try to open,you get an error message that reads,could not create the registry key.If Igo to Limewire.com,and try to log in with my email address,it does not recognize my email.I also did not recieve a link via email for future downloads,does anyone know what I can do ,so I dont have to repurchase!

How did you obtain LimeWire program if you never received the email? My guess is your email either went to junk mail or was filtered out as junk.
Check this link & its off-shoot links Problems getting your LimeWire Pro after payment or other pro payment issues, see "Account Activation" & follow the advice & links within