I would vote for this theory. What anti-virus and firewall stuff do you run? Some Norton monstrosity? Can you try turning it down and/or off for a bit? (I know, I know, be careful.)
I've tried re-installing it but have had no luck, it's starting to really annoy me now. Its not my specs, i've been told it can't be my connection, what else could it be?
Some other program that accesses the Internet could be causing a problem, or a faulty network card. It could even be your firewall. What do have running besides LFS when you try to connect?