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The installation folder was detected as C: drive because the key values stored in the registry key are different.

HKEY_CURRENT_USER\SOFTWARE\ej-technologies\install4j\installations
allinstdirs2530-5517-3353-2279
instdir2530-5517-3353-2279

This issue may be caused by using different accounts to install or upgrade Deep Security Manager.

To resolve the issue, do the following:

 
Always back up the whole registry before making any modifications. Incorrect changes to the registry can cause serious system problems.
  1. Create a folder named "installation" under HKEY_CURRENT_USER\SOFTWARE\ej-technologies\install4j\.
  2. Add the following string values:

    Value name: allinstdirs2530-5517-3353-2279
    Value data: D:\Program Files\Trend Micro\Deep Security Manager

    Value name: instdir2530-5517-3353-2279
    Value data: D:\Program Files\Trend Micro\Deep Security Manager

    Double-check if "D:\Program Files\Trend Micro\Deep Security Manager" is the right path. Otherwise, change the path to the correct one.

    Check the registry path

    Alternately, you can run the following REG command to add the entries without opening registry editor. Make sure to modify the data after.

    >REG ADD "HKCU\Software\ej-technologies\install4j\installations" /v "allinstdirs2530-5517-3353-2279" /t REG_SZ /d "<DSM installation directory>"

    >REG ADD "HKCU\Software\ej-technologies\install4j\installations" /v "instdir2530-5517-3353-2279" /t REG_SZ /d "<DSM installation directory>"

    Use REG command

  3. Restart the Deep Security Manager service.
  4. Upgrade the Deep Security Manager.

    Upgrade existing installation