It's a good idea for you to do the same and here's how. From the Control Panel, select System, then click on the Device Manager tab. Scroll to the Ports (Com and LPT) category, and select your modem's Communications Port (often COM1, but it could be COM2, COM3 or any other COM port) and then, click on Properties.
In the Communications Port Properties window, select the Port Settings tab, and check to see that the "Bits per second" rate is set to the highest possible value (usually 115200). Leave the values for Data bits, Parity and Stop bits at their default values.
Next, from the Device Manager tab select Modem and double-click on your modem's listing, which brings up the Properties window. Choose the Modem tab, and make sure your Maximum speed is also set at the highest possible value.