Perhaps as suggested by another member, check your friend's setup & see what difference there is between yours & theirs. I'm not sure the reason for your problem. I presume you have all other utilities such as spyware, etc. allowing permission for LW.
BTW ISP's have been known to only apply filters or shapers to individuals. Have you ever been able to connect to LW? Do you use games that play over the internet & do they work ok?