need file utility recommendation

[toolbox1234]

Friend of mine's pc was infected by a malware. I have to reformat and reinstall win 7 on it. However, all the files on his external drive are marked as hidden and system files. Is there a good file utility program that I can set all the file as not hidden and non-system file?
Thanks.

 

[whs]

How did these files get to the external drive. Is that an image?

 

[toolbox1234]

The files are "regular" files. The external drive was connected to his PC when he got the malware. The malware marked all the files hidden/system/read only. When I connect the external drive to a Vista based PC, I can see the files fine. If I hooked the drive to a Win7 PC, I don't see anything. If I do a "dir /a" on a command windows, all the directories and files show up.

 

[whs]

I would try a live Linux CD to copy them.