that's a pretty common problem on dsms, and i'm sure everyone goes through it at one point in time. the windows easily can go off track or get stuck while rolling up/down. theres a few things to do to fix this
1) take the door panel off to access the full window and clean it as best as possible.
2) clean the rubber lining around the window area. alot of dirt can get inside and prevent the window roll process from functioning properly.
3) lubricate the edges of the window (anything will work)
there is also a decent guide on
www.dsmtuners.com on the main page on how to fix the window problem. good luck.