Atari was also hurt because it had a weak lineup of games going into the second half. It was depending on games licensed from the movies ''E.T.'' and ''Raiders of the Lost Ark,'' games that have not been the blockbusters Atari expected. In the first quarter of next year, Atari will introduce five games that are derived from popular arcade games. Such games might restore its market share and could have made a difference if the company had them before Christmas. Mr. Gerard told analysts that the company was ''lulled'' by its previous success. In particular, its home video version of Pac-Man, though widely faulted for the quality of its graphic display, still sold extremely well. It came out just before the competition hit and made Atari think it could sell virtually anything. It couldn't.