Can you give a little more background info? What distro are you using, are you dual booting, is it a new install, did you make changes to your kernel, your partitions or grub before that?
While it's clear that grub couldn't find a kernel to boot, we need these Infos to help you find a solution.
You may want to replace the disk on that computer after you fix your boot. (As people said, with a recovery drive, probably the same one you use to install.)
After your computer is back, get a SMART client (like smartmontools) and check your disk status.