2001 Chevy Tahoe Lights radio 4 wheel drive

I have a chevy tahoe. The windows are really slow and sometimes will trip the gauges or make the radio go off. I realize that the window motors always go out in these trucks and that may be the issue. its all the windows though. At the same time my four weel drive buttons dont light up anymore and dont put the truck in four wheel drive. The security symbol comes up in the Box all the time, along with the battery symbol, but I have had the alternater and the battery checked and they both show good. At the same time when I put my lights on bright the radio will cut off? Or even when I turn the radio up to loud it will cut off?
Any help will be much appreciated!!!!!
Thank YOu very much

Blake Simpson