'on any programs'...

if that includes your web browser, ftp program, e-mail program, then you're most likely not connected to the internet at all.

what connection do you have?

if by 'any programs' you refer to other file sharing programs (kazaa, other gnutella clients, emule etc.), then it could be an issue with your router or firewall.

but, then, it would really help to know whether you have a firewall or a router.

and also:
what OS?
what version of limewire?

also: have you read the faq?

good luck!