What does it mean when your track light comes on and makes the car slow down

What is your question?

I had a flat tire this morning so I went and got 3 new tires and now the trac light is coming on and it slows down and is going to get worse if I don't fix it any suggestions on what to do or how to fix it

How long has your 2005 Lincoln Town Car had this problem?

Just started this morning