Hi there,
Assuming you have a dialer interface, that would be wrong. AFAIK, most DSL companies require PPPoE or associated authentication L2TP technologies. What you'll need to do is set that to your Dialer1 interface.
ip nat inside source static tcp 172.16.2.60 3389 interface Dialer1 3389
assuming the ip address of your computer internally is 172.16.2.60 and the ports are also 3389.
Regards,
Cisco_ guy that wants to help!