My processor has two fans the upper one doesn't work at all.

Is the upper fan in your power supply?

Your computer actually has 3 fans, one attached to the back of the case, one on the processor, and one in the power supply.

At any rate, fans are cheap. Go to Mwave.com, newegg.com, zipzoomfly.com, tigerdirect.com,.......you get the idea.

Measure your fan, preferably in mm or cm, and order several of the proper sizes and replace all three.