Operating System Not Found

I booted up my computer this morning, after briefly going on to play a
game that has worked fine for the past month. Where i was greeted with
Operating System not found.

So i got my startup disk, and it told me that the fat orfat32 partion
may be corrupted, or i may have a virus and so forth.

So i rebooted, and went into the bios, the hard drive has disapeared.

I took the power out, checked the connections, nothing wrong at all.

So i rebooted, and as i don't trust microsoft, i tried to install
linux, this told me there was no hard-drive in my machine at all.

I'm at a loss what to do, any help please.