Dragon Age 2

[Rockcrasher1]

Hi, for some reason every time I start game: I keep getting message "there is no disk in drive. Please insert disk into drive /Devise/Harddisk1/DR1". I have to close that window about 4 times. And then screen becomes black. I have to press CTRL+ALT/DEL and after exiting computer user window it get's me back to the game. and giving me new message at menu of the game: "You were not able to connect to Dragon Age 2. Please  try latter." But  after closing that window I can play further with out trouble. How to resolve it?