Vista Hangs on using Dialup Connection from Modem

[satyamy]

My Friend has a Dual Core (E2160) with Intel 945GCNL Board
and 56K Motorola Internal Modem
Running Windows Vista Ultimate

He is in Mumbai
Uses MTNL Dialup Connection (dial to 172231) to connect to Internet

while dialing Out of 20 attempts in 19 His PC gets hangs

This works fine on WinXP and Win98
but only prob is in vista ?
can anyone guess, wht can be the prob ?

[abhinandh]

may be due to lack of driver support.try using latest driver.

[Choto Cheeta]

may be due to lack of driver support.try using latest driver.

in that case it would hang on 1st attempt

while dialing Out of 20 attempts in 19 His PC gets hangs

why would it need to dial 20mins i mean, is not it getting connected ?? if yes then increase the Dialling attempts from 20 to 99 may be !!!