Problem with DVD Decorder

Question

Hi there,Actually i buy a new ACER Laptop few days back. Now i like to run view Movie Dvd's but as i put the dvd inside, an error comes showing that dvd decoder is not installed in ur system.On the other hand, i install few pc games in the laptop and after being installed successfully they are not been able to start.I am quite very tensed and upset with the same. Kindly help me regarding the same.ThanksSandeep