These are not my points. I am just copying and pasting from http://www.techsupportforum.com/microsoft-support/windows-vista-support/260386-operating-system-not-found-error.html. Somebody i know of found this solution useful when he got the error operating system not found in his hp computer. Here is the solution

Perform a Check Disk to repair settings

1. Enter the Boot options menu by pressing F8 as the computer starts up.

2. Select Safemode With Command Prompt

3. Once loaded, in the Command Prompt type chkdsk C: /f /r and press enter.

4. Once it has completed reboot the PC into Normal Mode

If this fails

Try the Startup Repair

1. Enter the Boot options menu by pressing F8 as the computer starts up.

2. Select Startup Repair from the menu.

3. Follow the onscreen instructions which will take roughly 5 - 10 minutes to complete and should reboot itself.

If this issue isn't fixed after this the only other thing would be to reinstall to see if that will fix the issue.

Reinstall Vista using Recovery Partition

1. Enter the Recovery Console menu by pressing F10 or F11 as the computer starts up.
**This is a small window so may take two or three try's. You may also consult the user manual to find the key used to enter the Recovery partition

2. Select The option to Reinstall/Install Vista

3. Follow the onscreen instructions to complete the full installation at which point it should reboot.

4. Once it reaches the desktop (If it has worked) let the software explorer reinstall the software, this can take roughly about 15 minutes

Failing this it might need the hard drive fixed or replaced.....

Using the Warranty

1. Take it back to the store who can then confirm you are JUST within the warranty period and they will send it to get repaired

Hope it helps
Source(s):
already given in the answer


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