I have an XP machine, while creating a dialup account i am facing a strange issue. When ever i try to create a dialup account the option of configure Using a Dial Up Modem option is disabled in it and only the last option "Connect using a broadband connection that is always on" is enabled.

Although earlies there was dial-up connection and it was working fine, i have re-installed the Modem driver but no luck.

Any suggestion what could be causing this ? and How to resolve it?