Patch 8 isn't supported on XP, Server 2003, and earlier.
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woody188, please see Supported platforms, environments, and operating systems for VirusScan Enterprise for details.
From KB 51111
"IMPORTANT: Windows XP and Windows Server 2003 are not supported. Patch 7 is the last patch that can install on these systems. Only customers with extended support contracts are permitted to use the product on Windows XP / Windows Server 2003. Refer to your extended support contract for details."