To remove it, use the script kill_amvo_virus_usb_en.vbs
The infected files/folders that are hidden and cannot unhide using Properties – Checkbox “Hidden” (disabled). This is explained by You cannot view or change the Read-only or the System attributes of folders in Windows Server 2003, in Windows XP, or in Windows Vista.
To unhide the folders, use command attrib as:
attrib -S -H /D /S