Can't retrieve my files from my passport drive

Anyone please help…

I am a photographer.
I have a Western Digital External Hard Disk 160GB.
I stored about 140 GB of customers photos and photo projects in my WD hard disk.
Very important to me.

Suddenly one day , i couldn’t access into my external Hard Disk.
I right click on the hard disk , out of my 160 GB , i have 6 GB free space, and used up 142GB which is true.
But i cannot see anything when i access into the hard disk.

I tried the following :

  1. I used my Kaspersky Internet security to scan it over and over again just in case it was infected by any kind of virus. No Virus found.

  2. I check on “the folder option” for “Show hidden files”, still failed to see anything on my external Hard disk.

  3. i tried my external hard disk on few computers, but remained failed to see any of my files.

Customers are rushing me to deliver the project photos.

Anyone have found the solutions , please share … please …

Livia , have you solved your problems? any method ?

Please help …anyone …