2002 Citroen C5 • 4 cylinder FWD Manual • 79,000 miles

I have a citroen c5, 2L Petrol, Manual Transmission car of year 2002. The car was parked in the garage and not used for 4 months. When I start the car after 4 months, it ran for about 1/2 mile and the traffic master in the car said that the licence is expired and then the engine shut down automatically. I tried to start again a couple of times, but it did not start. After a gap of about 10 minutes, I tried to start again and then it started only to get me back to my home and then stopped again. I have the same problem eversince, kindly advise what could be wrong? The car was anyways due for service before it was parked.
April 6, 2011.

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