uninstall the symantec endpoint
Try to remove add Remove Program
How to manually uninstall Symantec Endpoint Protection client from Windows 2000, XP and 2003, 32-bit Editions
If you don't have any uninstall password change registry setting.
HKEY_LOCAL_MACHINE\SOFTWARE\Symantec\Symantec Endpoint Protection\AV\AdministratorOnly\Security\UseVPUninstallPassword
Set to 0 to disable
Thanks In Advance
or you can use cleanwipe. you need to contact technical support to avail this tool.
Help Link: http://www.symantec.com/business/support/overview.jsp?pid=54619
have you try above comments for removing SEP client ?