I lost most of my Pictures ... Help my Guys

Hi

Guys I have a problem that i don't know from where and how I got it... My Friend Computer has lost most of his pictures. He doesn't know how all this happen... All what he knows that he send a picture to his friend, thats all, and his friend was using his mobile not a computer(Black Berry)...

My friend(the one that lost the pictures) didn't accept any file... But, after he send the picture to his friend, most of his pictures was gone...when he talks to him(the other one), he said that he had kind of a virus on his mobile, because also another person had the same problem with him...

The weird thing is that, the Hard Drive that has the Pictures (It is on a separate partition Not the main HD) has 29 GB is lost and it was taken from the HD but it's not there(you can't see it)... I mean the total size of the files in the HD is 21 Gb and the HD is 150 GB and the free size is 100 GB(approximatley) so there is 29GB is hidden in some place...

How do I get my picture Back again??? can I ??

Note:

I did scan My computer from viruses and Trojan and I did restore my computer to an earlier time but nothing is happen...

Have you done a simple search, if you remember the name of any of the pix/files?

open a any folder > click on Tools > Folder Options > view tab > first, make sure Show hidden files and folders is selected > next, uncheck hide protected operating system files > click on yes, when the warning pops up > then try looking to see if the files are visible