my security light won't turn off! on 2002 Buick Regal

My 2002 Buick Regal security light won't turn off and my car won't start can someone give me an idea of what might be the problem because it's my only way of transportation to and from work.

Asked by for the 2002 Buick Regal
Try to start it again I know its not going to start but wait 3 minutes and try it again If that don't work try taking the negitive cable off the battery for 1 minute
1 more answer
I had the same problem. The iginition switch will need to be replaced and the dealer has to do it. $650.