can't find the file in D drive

dear Norton Community,

recently my client come to replace their hardisk from 80Gb to 500GB, so i do a clean instal on the new 500GB hardisk. after that I continue to moved their old data in 80GB hardisk on D drive to the new one, but i found that the D drive was empty, even in the 'My Computer" indicates that the D drive isn't empty and have 25GB data in D drive, but when i open it there's no file except "RECYCLER" and "System Volume Information", and they're in "hidden file" mode.

 

is it this cause by virus attack or what ? i've already scan the hardisk and found no virus with my norton internet security which is virus definition updated.

 

anyone can help me with this problem ?

 

thx before.

 

regards