faulty drivers electric window?

I have a renault megane liberte car bought in 1999. The drivers electric window has stopped working although the passenger window still works. I swapped over the fuses and the passenger door still worked. Three years ago it stopped working after I left the garage for a service and MOT and I had to come back for them to repair it. If the passenger door works does this suggest it is not a motor problem. Could it be a relay problem? There are no rear electric windows.