My Murano will not accelerate when in drive, second, low, or reverse.

The engine light came on a couple of days ago quickly followed by the oil light, battery light and brake light. Yesterday when I went to turn on to a side road all of the sudden I was like I had no power. The car was still registering that I had rpms but if it was in drive or any "moving" gear it was like it wasnt registering that I was pushing the gas pedal. When I put the car in nuetral it would rev up with no problem. After a few blocks of this going on it finally started driving again. Then this morning it did the same thing. There was a belt sqeaking and I am wondering if the belt might be the culprit or if it probably isnt maybe it is a quick easy fix. Can anyone point me in the right direction?