This issue can occur if the service is corrupted. Please perform the following steps to troubleshoot the issue.
1. Access the link below to download the EAP.txt file:
http://cid-6df3bca839e981ef.skydrive...Public/EAP.txt ;
2. Rename the EAP.txt file to EAP.reg file.
3. Click Start, input "REGEDIT" (without quotation marks) in the open box and press Enter. Please click Yes.
4. Expand to Computer key, Click "File" menu and click "Export".
5. Please name the file as "RegBackup" (without quotation marks) and then save it to the C:\ drive as a backup.
Note: In case we need to undo the modification, we can double click this RegBackup.reg file to restore the registry key.
6. Double click the EAP.reg file and Click Yes to import it to the computer.
Then, please verify the following services again: Extensible Authentication Protocol, CNG Key Isolation
If the issue persists, you may perform an In-place Upgrade to repair the system.
1. Start the computer by using the current Operating System.
2. Insert the Windows 7 DVD in the computer's DVD drive.
3. Use one of the following procedures, as appropriate:
If Windows automatically detects the DVD, the Install now screen appears. Click Install now.
If Windows does not automatically detect the DVD, follow these steps:
a. Click the Start Button, type Drive:\setup.exe in the start search box and then click OK.
Note: Drive is the drive letter of the computer's DVD drive.
b. Click Install now.
4. When you reach the "Which type of installation do you want?" screen, click Upgrade to upgrade the current operating system to Windows 7.
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