They will be an improvement over the earlier versions. These are available from your modem's manufacturer's web site at no cost. These INF files are not drivers - they are Setup Information files, but are sometimes referred to as 'drivers'. The terminology will vary in different areas of the world. Explain that you are talking about the ratio between the signal and the background noise on the phone line.
Caution is advised here.
A very small adjustment can improve the signal without a proportional increase in noise. A larger adjustment would increase noise above an acceptable level and you would have to get it reduced immediately. Should you already have some symptoms of line noise , then you should ask the Provider to concentrate on this rather than directly on the Gain. While talking to him you might also ask about split lines, dry junctions, and so forth, as he may be able to help with your local connection. He is not responsible for a modem-quality connection but may have the onus for Fax quality which is similar.