Finally the solution
Well, after trying to trace the short, I called over my friend Eric, who has a degree in electrical engineering. He looked at the wiring diagrams and made an educated guess that the "convenience module" under the rear left seat was bad. After performing a few test and then a trip to the dealer to plug in a new module, voila, we have power front windows. I did not buy the new module, due to the lack of funds, but my problem is solved.
Damn this guy is good!!!!