Headlights Turn Off While Driving problems of the 2005 Volkswagen Beetle

I bought used. One headlight was working. The other one went out shortly after I got it. We replaced the hid lights with brand new halogen lights. Was working great! then I was driving to town late one night and my headlights went out. The low beams, I still had the high beams. Then I got pulled over cause my tail lights were not working. So I had to drive with my flashers on. Then the check airbag light came on and I need a new seat belt, cause it is not working right. The drivers door window would not roll down a little when I opened the door and the door would not lock. The lights and tail lights are making me mad cause no matter what we have done they never work. Help!!! I want it fixed!! I love my little convertible. I don't want to have to get rid of it.