It sounds like your hard drive has failed.
Missing Operating System
Setup did not find any hard drives installed on your computer.
Cause
This issue may occur if one or more of the following conditions are true:
- The basic input/output system (BIOS) does not detect the hard disk.
- The hard disk is damaged.
- Sector 0 of the physical hard disk drive has an incorrect or malformed master boot record (MBR).
- Note Some third-party programs or disk corruption can damage an MBR.
- An incompatible partition is marked as Active.
- A partition that contains the MBR is no longer active.
It's odd you can't access the BIOS though. What company did you buy the computer from?
Also, you could try this :
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Missing Operating System in Windows!
It really can't be more annoying than this: when sitting in front of the computer and start it, it gives you back a message saying "Missing operating system" or "Operating system not found" on boot. The reasons for these errors are hard drive is corrupted, Boot record is corrupted, BIOs did not detect hard disk, missing or corrupted command.con, virus infection, etc.
Fix it with Windows OS DVD
1. Insert Windows OS DVD on your computer.
2. Click the key when you are asked to (to boot from DVD).
3. Then choose "Repair your computer", not "Install now", remember this.
4. Select the operating system after the installer searches for Windows installation, and click "Next".
5. Then click "Startup Repair". It will automatically fix problems that are preventing Windows from starting.