Uh Oh

I woke up this morning, turned on my laptop at home, and got the following message:

Operating System Not Found

I'm a little fuzzy on the good bad thing, but I think this leans toward to the bad side.

Help?

Addendum: Apparently the Operating System was either taking a nap or playing hide and seek and got bored. The next day, all was normal. Ah, the wonders of technology.