Hidden folders in pen drive-because of virus

Hello,
I am new to this forum and like to ask help to you;
Folders in pendrive were changed to hidden by virus attack, unable to change to visible as the hidden tick box in the properties of folder is grayed. Any tools to remove the hidden attribute in the pen drive please.
Thanks


start->Run->cmd 
attrib -h -r -s /s /d h:\*.* 


best of luck

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