i got the same isue....reviewed a fresh instalation of w2000 and xp....and is spyware from microsoft....you can check the port it uses and close them form your firewall...i't something related to the "client experience..." you know...garbage from microshit....it just send udp poackages to addresses taht are owned to micros...and have nothig inportant on it...just info about general beahvior..anyway..is a violation to privacy...don't you think?¿!