vista with pppoe

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 the connection goes for 30 seconds and do the same problem again
please help am having this problem on severl computers having vista

p.s i tried XP on the same computer it worked welll with no problems

Not sure what this has to do with Mikrotik?

If so, please state the operating system version number.