Installation, maintenance, repair and upgrading of computer networks; installation, maintenance, repair and upgrading of computer systems; installation, maintenance, repair and upgrading of computer hardware; updating of computer hardware; Computer consultation; computer diagnostic services; computer disaster recovery planning; computer services, namely, data recovery services; computer software consultancy; computer software installation, maintenance, repair and upgrading; computer technology support services, namely, help desk services; computer virus protection services; customization of computer hardware and software; providing information at the specific request of end-users by means of telephone or global computer networks; recovery of computer data; technical support services, namely, troubleshooting of computer hardware and software problems