Huge problem!

[icecold]

I was doing routine work, uploading an image using CPanel, in my live shop. the moment I finished uploading I tested the image, and what I got was a blank page! I went to the /cache/ to see if there were any errors and couldn't find any, then I realized all my /includes directory was GONE!, nothing was there, I am sure I didn't delete it by mistake, so I tried with a few backups I had and nothing, still a blank page! What's weird is when I restored one of those include directories, my admin login started to work ... I am able to login to the administration but not to the store! This is a live store as I said so it's imperative that I solve this ASAP.