How to recover from the no-boot situation caused by the failed installation of Windows 7 or Windows Server 2008 R2 SP1

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To recover the no-boot situation, you need to do system restore or revert to Windows 7 RTM:

1. Apply System Restore from the Windows Recovery Environment (WinRE)

At boot-up, Hit F8 --> Repair --> System Recovery Options Window --> System Restore

2. If the system restore failed, you can use the following command to revert to Windows 7 RTM running state:

In the WinRE, run the command prompt and run the following command:

DISM /image:C: /cleanup-image /revertpendingactions

3. You can also perform an inplace upgrade of Windows using your DVD media.