Dell OptiPlex 745 computers have a problem with Symantec Antivirus Corporate Edition version 10. The startup scan goes into an endless loop and the computer black-screens. This is caused by a conflict with the SATA optical driver in the Dell XP installation. Upgrading to SAVCE 10.1.5.5000 fixes the problem. (All of the 745 images from OSL Support have this version of SAVCE).