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Short bio

PUM.Optional.NoViewOnDrive is Malwarebytes’ detection name for potentially unwanted modifications (PUMs)in the Windows registry where all drives are hidden from the user. Such changes could be made by malwareto hinder users from removing it.

System modifications

The following registry value data are modified:UnderHKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\ExplorerFrom:NoViewOnDrive=0To:NoViewOnDrive=67108863UnderHKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\ExplorerFrom:NoViewOnDrive=0To:NoViewOnDrive=67108863


Malwarebytes can modify these registry value data back to their Windows default settings without user interaction.Also, we advise users to do a full system scan as PUM.Optional.NoViewOnDrive could have been added to the system by malware or a PUP.

Add an exclusion

When a Potentially Unwanted Modification (PUM)is detected on your computer, Malwarebytes for Windowsdoes not know whether it was authorized. Optimization software, malware, and Potentially Unwanted Programs (PUPs) are known to make these types of changes, hence they are regarded as potentially unwanted by design.To have Malwarebytes for Windowsignore a PUM, you must add the PUM to the Allow list. Here’s how to do it.

  1. When a PUM appears in the list of Scan results.
  2. Uncheck the entry or entries related to the PUM.
  3. Then click on Next.
  4. You will see a prompt giving you several options.
  5. Choosing Always ignore will add the PUM to the Allow List.
  6. You can remove them there when you decide they should no longer be ignored.
  7. When the PUM is on the Allow list it will no longer show up in your Scan results.