The computer has provided some wonderful opportunities for our children. Although research on the effects of children's use of computer is still ambiguous, some initial indications of positive and negative effects are beginning t emerge. They commonly use computers for playing games, completing school assignments, email, and connecting to the Internet. This may sometimes come at the expense of other activities such as homework or normal social interchange. Although most children seem to naturally correct the problem, parents and educators must monitor the signs of misuse. Studies of general computer users suggest that some children's may experience psychological problems such as social isolation, depression, loneliness, and time mismanagement related to their computer use and failure at school. The purpose of this study is to investigate issues related to computer use by school students from 11 to 18 years old. The survey included a representative sample of 439 school students of ages 11 to 18. All of the students came from 3 gymnasium schools and 5 high schools of Iaşi, Romania. The students answered to a questionnaire comprising 34 questions related to computer activities. The children's parents answered to a second questionnaire with the same subject. Most questions supposed to rate on a scale the frequency of occurrence of a certain event or issue; some questions solicited an open-answer or to choose an answer from a list. These were aimed at highlighting: (1) The frequency of computer use by the students; (2) The interference of excessive use with school performance and social life; (3) The identification of a possible computer addiction. The data was processed using the SPSS statistics software, version 11.0. Results show that the school students prefer to spend a considerable amount of time with their computers, over 3 hours/day. More than 65.7% of the students have a computer at home. More than 70% of the parents admit they do not or only occasionally discuss computer use with their children. This indicates the fact that, although they bought a computer for their children, they do not supervise the way it is used. The family is rather a passive presence, vaguely responsible and lacking involvement. But, the parents consider that, for better school results, their children should use their computers. This study tried to identify aspects of computer addiction in gymnasium and high school students, as well.