What would cause a mouse to stop working?

[gplracer]

My friend has windows me. He was on the computer when all of a sudden the mouse stopped working. It is a logitech cordless mouse. He replaced the battery but that did not do the trick. He tried to use system restore but it would not work for some reason. It say it could not restore to the date selected. He picked four different ones. How could we fix this? I really think it is a windows problem. The mouse is only a month or so old. I am going to give him another one tomorrow to try just in case. Thanks!