I have bought a 1999 daewoo lanos that wont start. I bought the car knowing that there was a problem?

i knew there qwas a problem with starting the car, i was told it was the ignition. i had a guy to check it out, he has put new starter motor on, still no luck, the car will start on bump or jump and will run until turned of with the key. i was told i needed and imobiliser key, and then i was told you would not be able to drive it if this is so, im confussed could somebodyn help|||That is a coded key. If it does require that key, you have to find the dealer that sold the car originally. That would sound about right. The key cuts the battery power off from the car. These have been in cars since about 1988. Many high end cars had them, and now every car has them. It will run you about 100.00 dollars for the key