Power window slows and stops half way up, goes completely down.

I've had the same thing happen on my VW Beetle. I ended up diagnosing it as the window being misaligned in the track, causing it to start binding when it was going up. You may be able to verify that by putting your hand flat on the glass and pushing the glass toward the front or the back of the car as it rolls up. If that allows it to close, you'll need to remove the door panel to get to the window regulator mechanism. On the bug, the adjustment was done by moving the window in the clamps that hold the window to the regulator. I had to lower the window to about the 2/3rds open position to align the clamps with cutouts in the door frame, loosen the clamps and reseat the window, then tighten them and test. On other cars you may have to loosen the entire regulator mechanism and use that as the adjustment instead. You'll probably have to do that a few times before you find the right position that allows the window to travel freely through the whole range of motion. Hopefully the service manual pointed out by @jayeff will show you how to remove the door panel and tell you how to get to the regulator, and perhaps even document the adjustment procedure.