I understand that you are unable to boot to the Windows 8 desktop as it displays an error
message: “acquiring information and diagnose, unable to repair”.
You are running dual boot on your Computer with Windows 7 set as default.
Please answer the following question for better understanding of the issue:
1)Do you have any anti-virus program installed on the computer?
Method 1: Perform an Automatic Repair of Windows 8 using the installation media.
a)Boot the computer using Windows 8 installation media.
b)In the “Windows Setup” dialog box that appears, set the Time and currency format, Keyboard or input method and the language to install and then click “Next”.
c)Click on “Repair your computer” from the lower left corner.
d) From the “Choose an option screen”, click on “Troubleshoot”.
e)Click “Advanced Options” in the “Troubleshoot” screen.
f)In the “Advanced Options” screen, click “Automatic Repair”.
g)Follow the on-screen instructions to complete the Automatic Repair.
If you do not have Windows 8 installation media try to create a bootable disk or USB drive using another computer. In order to create an installation media, you may refer the article: “How to create installation media for a PC
refresh or reset” from this link: