Don’t worry, your files are probably okay!
How to Fix the ‘Operating System Not Found’ Error
reboot your gear.
The error could be a temporary glitch that a restart will fix.
If you don’t see a normal restart option, use theCtrl+Alt+Delmethod.
If it’s not,change the boot orderso that it is.
Toggle UEFI Secure Boot on or off, depending on what it’s set at right now.
Whether Windows can boot inUEFImode depends on whether it’s on a GUID Partition Table disk or anMBRdisk.
Enabling or disabling Secure Boot can determine if the error is related.
ToggleSecure Bootto whatever it currently isn’t, so eitherEnabledorDisabled.
kickstart your machine after this step.
Reset BIOS back to factory default options.
It might be a function key likeF9that you should probably press, or a menu option calledReset BIOS.
The specific steps you better take depend on the BIOS manufacturer.
Repair the boot records.
Valid boot records are vital for a normal boot process.
See how torepair the MBR in Windows XPif you’re using that version of Windows.
Another way to fix some Windows XP boot files is byrepairing the boot.ini file.
Use thediskpart commandto activate the partition that Windows is installed on.
Exit Command Prompt and chooseContinueto try starting the operating system.
Reseat the hard drive’s power and data cables.
Unplugged or loose cables could be the cause of the error.
Reinstall the Windows operating system.
The Operating System not found error might be literal.
It’s possible that malware or an unintentional format has wiped the OS from the hard drive.
If you could’t enter the hard drive to reinstall the operating system, Step 10 is your last option.
