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i think there was a way of turning the modem sounds off
There was, and on my computer there still is. To get to it you need to get to the device via control panel and then click propoerties. Check through the different options / tabs your're given. You may have the feature too. Try turning the volume all the way off.
If that doesn't work, you may want to reinstall the drivers (as suggested above) Since it just started happening out of the blue, chances are something had a little hiccup. You could even go to the device manager, remove the device, restart and let windows re-detect and re-install. That might be enough to fix. Otherwise, grab your disk and re-install.
Good luck.