To configure an installed modem
Open Modems properties in Control Panel.
Select the modem you want to configure, and then click Properties.
Make the changes you want:
Change the Port, Speaker Volume, or Maximum speed settings on the General tab.
Change Connection preferences or Call preferences settings by clicking the Connection tab.
Change Port Settings or Advanced connection settings by clicking the Connection tab, and then clicking Port Settings or Advanced.
Another way to open Control Panel is to click Start, point to Settings, and then click Control Panel.
If step 1 displays the Install New Modem wizard instead of the Modems Properties dialog box, then follow the instructions on your screen to install the modem.
For Help on an item, click at the top of the dialog box, and then click the item.
also look at you help and support on your start menu , type in modem in serch,and theres a trouble shooting item