Q: Won't show log in page

I was just going along using my laptop like normal, then the battery died. So I plugged it in a turned it back on, and now it won't even show the log in page. Instead, anytime I reboot it takes me to a page for the OS X, and it gives me the option to download OS X from a backup, reinstall OS X, get on Safari to look for an answer, or totally wipe my harddrive and start over. The first two it won't even let me do, and I really don't want to delete everything and start over.

I tried running diagnosis and it said nothing was wrong, and I checked the harddrive and it's fine. Nothing seems to be wrong.