1. Download a new copy of the (latest) patch for VSE to make sure that you are using undamaged files.
   
   
   McAfee Enterprise product software, upgrades, maintenance releases, and documentation are available from the Product Downloads site.
   
   NOTE: You need a valid Grant Number for access. See KB56057 - How to download Enterprise product updates and documentation for more information about the Product Downloads site, and alternate locations for some products.
2. Run a local, silent, forced-installation: 
   1. Click Start, Run, type cmd, and then click OK.
   2. Change to the directory where the patch installation files are located.
   3. Run the installer. Type the following command and press Enter:
      
      SETUP.EXE FORCEMSP=True /q
      
      Now when you see the VSE icon in the notification area, you see the patch as expected. 
       
3. Obtain the VSE installation log file and check for errors: 
   1. If you are installing locally, navigate to %temp%\McAfeeLogs
      If you are installing via an ePO deployment, navigate to %windir%\temp\McAfeeLogs
       
   2. Open VSEINST_PatchN_123456_123456.LOG to identify the cause for the installation failure.
      
      PatchN represents the Patch version and the numeral values represent the installation date and time.
       
   3. Take the appropriate remedial action. For example, if there is a disk space issue, make sure that enough free disk space is available. 
   4. If you can't see the cause of failure from the log, try to reproduce the error and note the actions needed. It helps Technical Support investigate the issue.
       
4. Because VSE uses Microsoft Installer (MSI) to install the product, check in Windows Event Viewer Application log for patch installation failure events and identify the MSI error code reported:
   1. Try to identify the error in the install log.
   2. Verify the meaning of the MSI internal error codes. 

• HKEY_LOCAL_MACHINE\SOFTWARE\McAfee\DesktopProtection\Patch_n
  
  The path is used to validate that patch n is installed.
   
• HKEY_LOCAL_MACHINE\Software\Network Associates\ePolicy Orchestrator\Application Plugins\VirusScanxxxx, HotfixVersions
  
  The path is used in ePolicy Orchestrator (ePO) patch deployments to verify if a patch has already been installed.
  
  Patch_n is used to determine what Patch is expected to be installed, and what must show up in the VSE About window as a result.
  
  xxxx is used to determine what version of VSE is installed, and what must show up in the VSE About window as a result.
   

To correct missing patch versions, silently force-install the appropriate patch locally:

1. Download a new copy of the latest patch.
   
   
   McAfee Enterprise product software, upgrades, maintenance releases, and documentation are available from the Product Downloads site.
   
   NOTE: You need a valid Grant Number for access. See KB56057 - How to download Enterprise product updates and documentation for more information about the Product Downloads site, and alternate locations for some products.
2. Click Start, Run, type cmd, and then click OK.
3. Change to the directory where the installation files for the patch are located.
4. Run the installer. Type the following command and press ENTER:
   
   SETUP.EXE FORCEMSP=True /q
   
   Now when you see the VirusScan icon in the notification area, you see the correct patch.

If the About VirusScan Enterprise information shows the correct Patch Versions, but not in ePO's properties, verify the contents of LastProp.xml for the field szHotfix.

If szHotfix is the same as the version shown in the About window, the issue is with ePO and solved with an Agent Wake Up that collects Full Properties.