general problems of the 1999 Buick Regal

I purchased a 1999 Buick Regal LS new. I have had to replace the front driver side and rear driver side power door locks in the past. My biggest concern is that I currently have the front drivers side as well as the rear passenger windows falling down with the power windows not working at all. I also have the front passenger window not working but at least that one window stays up. I fear for our safety due to the windows falling down at any given time. This has happened to my wife several times while driving. My wife and I are over age 57 with no children in the home. We hardly use the windows. These parts are prematurely falling apart and we are requesting a survey and safety investigation on the 1999 Buick Regal and any other gm vehicles containing the same or similar mechanism and power units used to secure and move windows up and down. The window can drop down at high speeds causing serious injury depending on weather conditions or as a reaction by the driver to a sudden loss of pressure. Please help us. Sincerely, robert and penny amrine. Cary, nc.