In order to utilize the V.92 technology, you either have to have a V.92 modem and call waiting service on your phone line.
If your have a V.90 modem with updateable drivers/firmware. Always keep your drivers upgraded! Here you can find a list of places to get updated modem drivers. If you are unable to find V.92 drivers for your modem, call your computer manufacturer and ask them when you can expect to receive them. If your modem is not V.92 capable, it's still recommended that you get the most updated V.90 drivers for improved performance.