my firewall is showing something weird..and i tried to google the answer..i found nothing

is there a port 14575?
heres the situation...im being bombarded by something in port 14575..i think its bogging my comp.
but heres the problem...the remote hosts keep changing so i cant set up any special rules to block a specific ip number.....
anyone know anything about this port?
my firewall is blocking these packets but the occurances are astounding....up to and over 100 occurences to that specific port
from several hosts
as said before i tried to search for the answer online..and had no luck..people here seem to have been alot of help in the past..please dont laugh it may seem like a stupid question..but any help would be appreciated...this has been going on for a few weeks but i have yet to take it seriously since it shows that my firewall was blocking these packets...if anyone can lend a hand i would appreciate it
im running windows xp home
if you need anymore info i will be glad to help where i can..or if you have a helpfull link i will do some research on the subject at hand.
thank you in advance.

cyber