Local disk C cannot be accessed after laptop refresh?

Hi, my sister purchased a new laptop (Sony Vaio model: SVF14212CXW) 2 weeks ago.

It was working fine until one day the internet connections available did not show up; we couldn't click on it. So, we tried restarting it and we never got to the login page. The Vaio logo would show up, but then the screen would go black, but the computer was still on. I tried restarting it and I even took the battery out and tried starting it again. Finally, i read online about opening up the CD drive and inserting a random CD, then turn the computer off, then start it up again. That did the trick, but from there I hit Refresh the computer.

I knew the apps would disappear and i would have to reinstall things, but now it says i do not have access to the Local Disk: C, and I cannot download anything or try to fix anything, even though I am on the administrator account. Anyone know how to fix this? As of right now I can use the internet, but i can't change any settings, can't access the local disk, and there is a problem with the driver.

Help please!!

Thanks!