Quote Originally Posted by gizmo1_1
If the new modem installed correctly, you can go to dial-up networking, Right click your connection select properties. Then change the device it uses to dial up. The old modem will still be listed as the connection device. Simply pull down the drop down box and select the new modem.

That is probably the problem O-man. If you do change it and it still doesn't dial out, you may just have a bad modem. At least 5% of new modems don't work, so always have a few extras.
Also, as a t'shoot measure, you can always use Internet Connection Wizard to check your outbound connection just to eliminate any potential proprietary dial up software issues.