To prevent the uninstallation of McAfee ePO agent when installing or upgrading OfficeScan client:

1. On the OfficeScan server, go to the ..\Program Files\Trend Micro\Officescan\PCCSRV\Admin folder.
2. Look for and back up the tmuninst.ptn file.
3. Open the file using a text editor like Notepad. Comment out the entries below with a semicolon (;).
   Here is a sample:

   ;[ePOAgent1000]
   ;ProductKey = HKEY_LOCAL_MACHINE\SOFTWARE\Network Associates\ePolicy Orchestrator\
   Application Plugins\ePOAgent1000
   ;UninstallKey = HKEY_LOCAL_MACHINE\SOFTWARE\Network Associates\ePolicy Orchestrator\
   Application Plugins\ePOAgent1000
   ;Platform = Win95 | Win98 | WinNT
   ;UnloadProgram = GenericUnload
   ;UninstProduct = UninstVirusScan45
   ;Support = 1

   ;[ePOAgent2000]
   ;ProductKey = HKEY_LOCAL_MACHINE\SOFTWARE\Network Associates\ePolicy Orchestrator\
   Application Plugins\ePOAgent2000
   ;UninstallKey = HKEY_LOCAL_MACHINE\SOFTWARE\Network Associates\ePolicy Orchestrator\
   Application Plugins\ePOAgent2000
   ;Platform = Win95 | Win98 | WinNT\
   ;UnloadProgram = GenericUnload
   ;UninstProduct = UninstVirusScan45
   ;Support = 1

   ;[ePOAgent3000]
   ;ProductKey = HKEY_LOCAL_MACHINE\SOFTWARE\Network Associates\ePolicy Orchestrator\
   Application Plugins\ePOAgent3000
   ;UninstallKey = HKEY_LOCAL_MACHINE\SOFTWARE\Network Associates\ePolicy Orchestrator\
   Application Plugins\ePOAgent3000
   ;Platform = Win95 | Win98 | WinNT
   ;UnloadProgram = GenericUnload
   ;UninstProduct = UninstVirusScan45
   ;Support = 1

4. Save and close the file.
5. Restart the OfficeScan Master Service.