I am not sure where your pictures have hid themselves however you can hook the phone up to the computer and do a search for the files. *.jpg is the default I believe. If the pictures were downloaded from the net then look in the download folder. Media should be there I dont guess it is necessary for the phone to work but check that it is not hidden.

 

Not sure of whats going on what ROM are you using? is it the Stock ROM that came with the phone? Have you removed the SD Card from the phone and tried accessing it that way?

I would look into getting something like drop box to transfer files between phone and computer. I think the "Cloud" way is one of the easiest ways to go. If you want more storage check out ADrive. No android app yet but still a decent service.

 

well you can't access your card when it is connected to your pc. have you tried to use a file manager? they should be under dcim. are they photos you took? or are they downloaded from a website. if so then they are in the downloads folder. if they are photos then select camera. they should be there.