Troubleshooting:After upgrading from Vista to Windows 8 my computer worked fine for a few days and then got error saying OS not found next time I turned it on.

After upgrading from Vista to Windows 8 my computer worked fine for a few days and then got error saying OS not found next time I turned it on.

I save turned it off and on a couple times but don't ever get to a screen where I can do anything.

Keys to the Problem After upgrading from Vista to Windows 8 my computer worked fine for a few days and then got error saying OS not found next time I turned it on.

Download SmartPCFixer to Fix It (Free)

refer to the suggestions of nair
http://answers.microsoft.com/en-us/windows/forum/windows_8-system/error-message-operating-system-not-found-and/468c41d6-8f77-469c-a6fe-637e5934303f

If you failed to fix it, another option is to call Microsoft and walk through the process with a technician. To do this, dial "1-800-936-5700". Explain the error that you received and the steps in the update process during which it was displayed. The technician will be able to walk through the steps from getting a new product key to finishing the installation.

Recommended Method to Repair the Problem: After upgrading from Vista to Windows 8 my computer worked fine for a few days and then got error saying OS not found next time I turned it on.:

How to Fix After upgrading from Vista to Windows 8 my computer worked fine for a few days and then got error saying OS not found next time I turned it on. with SmartPCFixer?

1. Click the button to download SmartPCFixer . Install it on your computer.  Open it, and it will perform a scan for your system. The errors will be shown in the list.

2. After the scan is done, you can see the errors and problems need to be repaired. Click Fix All.

3. When the Fixing part is finished, your computer has been speeded up and the errors have been removed

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