What is wrong with my 04 Renault Megane's electrical system?

I have an 04 Renault Megane and have a few faults that I see seem to be the norm for them! My drivers window was going up and down when double locking the car and this has now stopped working! Also the radio has just stopped working? and both headlights have blown at the same time as the radio! Is this related do you think? If I am right it is a different fuse for the radio and lights? Also my car is approaching the final month of the 3 year warranty do you think Renault will still be willing to look at the faults seeing as the window in particular is a know fault. Thanks