Its your power window motor.. they die quickly in these cars.. you will have to have it replaced..
And i wouldnt bother with a junk yard part as it will most likely be dead or dying.. I had my mechanic fix it for $225CND.
Usually they will work, then start to get slow.. then sometimes they wont work or only work for a few secs then nothing.. and will work again after another few secs..
If you fix it yourself you can save a few bucks.. but its a pain in the ass, if you do it be sure to lube up the window track while you are in there.