1. A computer program product for controlling a computer, said computer program product comprising: (i) scan request receiving logic operable to receive a request to perform an on-access malware scan upon a computer file to which access is to be made; (ii) scan dividing logic operable to divide said on-access malware scan into a plurality of tasks; (iii) task issuing logic operable to issue said plurality of tasks to be performed by a plurality of different computers; and (iv) result collating logic operable to collate a plurality of task results corresponding to said plurality of tasks and received from said plurality of different computer to form a scan result corresponding to said on-access malware scan.