Sailor Steve

They're right, there are several programs which do a lot more. However, if you just want to adjust the volume, go to Start/Programs/Entertainment/Sound Recorder (I think I may have missed a step between Programs and Entertainment, but I can't look it up on the library's computer, so I'm going from memory). Once the little Sound Recorder box is showing, you can load any .wav file and adjust the volume.

Also look in the Help section. It will tell you more than I can from where I'm at.