When youreExternal Driver's folder hide reason for virus then you can use Folder Unhider.
Folder Unhider is a user-friendly software solution developed as a means of helping you retrieve hidden data on your virus-afflicted external drive.
Folder Unhider is meant to address the situation when the external drive is exposed to different threats and attempt to undo the malicious effects of malware on your external drive, enabling you to access the hidden folder once again by making it visible to you and your computer.
The application is fairly simple to understand, all you need to do is select the drive that is giving you trouble and press on the 'Run' button. Folder Unhider will then process the contents of the device and try to unhide any directory you cannot see. Additionally, it features a progress bar that allows you to view the undergoing process and know whether it has accomplished its task successfully.
Operating system:Windows XP / Vista / 7 / 8 / 8 64 bit
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Folder Unhider 1.0.0.0 
