There is no denying that computers affect nearly every aspect of the workplace, including the workforce itself (Potosky & Bobko, 2004; Wiechman & Ryan, 2004). Although many researchers have already examined positive and negative reactions to computers (e.g. Carey, Chisholm, & Irwin, 2002; North & Noyes, 2002; Popovich, Hyde, Zakrajsek, & Blumer, 1987; Weil, Rosen, & Wugalter, 1990) there is relatively little research concerning employee’s attitudes and how they influence the use of computers at work. Reactions to computers may be a special concern for organizations many reasons including employee productivity, job stress, theft of resources, piracy, contraction of viruses, and misuse of communications. Accordingly, the current sought to understand what variables may influence personal use of work computers by developing and testing a model, based on Ajzen’s theory of planned behavior (TPB; 1985) and including the Big Five personality dimensions (Goldberg, 1990). Results indicated that positive computer attitudes were the most predictive of counterproductive use of computers. Additional findings and implications are discussed.