good morning!!!!
my volt did the exact same thing a few month's ago
our volts have a rubber track enclosing the window track now, where in bygone years,the window track was enclosed with a different material and a nice window track as well
my rubber window track actually attached itself to both sides of the window,making the squeaking noises as it was dragging across both sides of the window
I got an aerosol can of silicone lubricant and sprayed both sides of the windowtrack about halfway down the window.and continually operated the window to make sure it was well lubricated
this did the trick,and fixed my problem
this problem first started about a year or so after I bought my volt,so I guess a little preventative maintainance is in my future in a few month's
I hope this help's!!!