Have you gone to the manufacturer's site and located your particular model? In most cases, the manufacturer will have a "download" tab with all available drivers and utilities.
Most touchpads work without a specific driver. Is yours not working? Did it arrive that way, or have you made changes that caused it to stop working?
The original windows was windows Vista and when I ve change it whit windows 7 it didn`t work,I ve talk with some people and they tell to find a driver for my keyboard or touchpad...but I can`t find it.
I don't see a model B.V., however. If you can find your model here, you will find drivers.
I do not endorse the following site. In fact, I have _never_ used a driver-collecting site because I consider them to be at risk for viruses. If you are less paranoid than I am, you might look at something like http://www.drivershq.com/driver-update/Keyboard-Mouse-Touchpad/SYNAPTICS/SYNAPTICS-PS-2-PORT-TOUCHPAD/PACKARD-BELL-SYNAPTICS-TOUCHPAD-DRIVER/ .