am having kind of same problem when ever i dial up using pppoe after 30 seconds maximum one miniute every thing related to network freezes and connection stops

hello all i have a problem i have windows vista when ever i dial using pppoe at like 30 seconds the network freezes and connection goes off the computer still runs well but every explorer freezes as well as for the network card, pppoe icon every thing related to the connection pppoe after i restart ...