usually by replacing window regulator.
change the window seal / gasket.
you need to replace the window regulator
Try a silicone lubricant.
You can purchase a repair car window kit that has the instructions on how to fix your crack. If you have insurance however, I would recommend getting a repair shop to fix it since it is covered on your isnurance.
Hold down the child lock when you press the button to raise the window.
No
If its an automatic window, then the motors may be about shot. If its a manual window, have the tracking checked, it may be slipping off track.
that car has issues with the windows and VW knows about it! Call your local VW dealer and ask if they will fix it for free! they would fix all of them for free awhile back regardless of the milage on the car!
Do NOT pour hot water on a frozen car door, your window will definitely not make it! Cold window in frozen car door+hot water=broken window. Try taking your ice scraper and actually prying the door along the seal to get it to pop open.
buy a descent car
You can go to an auto repair shop or a mechanic to fix this problem. They will fix your window and also tell you how to keep it maintained to work properly if you ask them.