Access the Boot Options option and check the Safe Boot option, then select OK .
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Restart your system so that the configuration is applied on your Windows Server 2012 system.
Press Windows + C key combination to open Settings.
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Click on Power , press and hold the Shift key, then click Restart .
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Wait until the popup window appears, and click on Troubleshoot .
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Click to select the Advanced Options option.
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Click on Startup Settings .
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Click Restart.
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On the Advanced Boot Options popup window, select Safe Mode and then start your Windows Server 2012 in Safe Mode.
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Press Windows + C key combination then click Start to open Start Screen.
Right-click on Start Screen and select All apps .
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Right-click the Command Prompt and select Run As Administrator .
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Select Yes .
Enter Bcdedit / set {bootmgr} displaybootmenu yes into the Command Prompt window and press Enter .
If you do not want to be prompted to enter the option at startup, change Yes to No.
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Once completed, restart your computer, then press F8 to open the boot process setup window, then press F4 or 4 to boot in Safe Mode.
Good luck!