2003 GMC Yukon UNKNOWN DRIVER truck will not start with bot

Computer problem
2003 GMC Yukon Two Wheel Drive

yesterday truck was running fine. My husband took the radio out to look at the wiring but did not disconnect it and then put it back in. The truck would not start, the key fob would not work to lock or unlock, and the front windows would not roll up, and now reads unknown driver, when before would read Driver 1, the truck sounds like it is going to start but then acts like it has a kill switch and dies. I tried looking it up on the internet and I know that it has some type of security system that needs to be disarmed or something it might have the passkey 3 system. Please help. Thanks.