Alternator/generator/regulator problems of the 2000 Volkswagen Jetta

I purchased a used certified 2000 Volkswagen Jetta in January 2004, after only one week of purchasing the vehicle, the engine light came on, the accelerator was making a vibrating sound and stalling continuously. Okay, the transmission went out and it had to be replaced at my expense - I purchased a used transmission and then the engine throttle failed and the car wouldn't even start one day - had that replaced at my expense $1700. No the old parts are not available. Okay, there's more, the brakes have been replaced a total of four times within three years, the engine light is still on, air bag light on, brake light on, lights and fog interior fuses and exterior lights have been replaced I don't know how many times, I have put so much money into this vehicle - and it still is running badly. As of today, the car won't move without warming it up first for about 45 minutes fully - when you press on the accelerator without warming it up first - it will stall and make a loud embarrassing noise as if the engine is going to explode - and you have to literally make it move by pressing very hard on the accelerator and praying that it won't just shut off while driving and never start again. My vehicle has 117,000 miles on it had 43,500 when I bought it (I know stupid wasn't I) it was my first vehicle. I know a car is not suppose to last forever, but dam does it have to cost so much to try and keep it running until it dies. Please help me with any information you may have to assist me in this matter.

Problems with vehicle's brake lights. On three occasions, the window regulator clips were replaced. Currently the brake light switch needed to be replaced for a third time.

When operating driver power window it went down 2 inches then fell in the door. The same happened to the passenger front window on 16 April 2002. Dealer replaced the regulator in both windows. Nlm.