Windows Server 2012 R2 Boot Repair Jun 2026

To repair the boot process for Windows Server 2012 R2 , you must boot from installation media to access the Command Prompt within the Recovery Environment. 1. Accessing Recovery Environment Insert the Windows Server 2012 R2 installation disc (or USB) and restart the server. Press any key when prompted to boot from CD or DVD . Select your language and keyboard layout, then click Next . Click Repair your computer in the bottom-left corner. Navigate to Troubleshoot > Advanced Options > Command Prompt . 2. Repairing the Boot Sector (MBR/Legacy) Once the command prompt is open, run these commands in order to fix the Master Boot Record and boot configuration: bootrec /fixmbr – Fixes the Master Boot Record. bootrec /fixboot – Writes a new boot sector to the system partition. bootrec /rebuildbcd – Scans for Windows installations and lets you add them to the Boot Configuration Data (BCD). 3. Manual BCD Rebuild (If RebuildBCD Fails) If the system cannot find any Windows installations, you may need to export and delete the existing BCD store before rebuilding it: bcdedit /export C:\BCD_Backup . c: (or your system drive). cd boot . attrib bcd -s -h -r (removes system, hidden, and read-only attributes). ren c:\boot\bcd bcd.old . bootrec /rebuildbcd . 4. Repairing UEFI/GPT Bootloaders If your server uses UEFI , you must repair the EFI partition instead: Enter diskpart , then list vol to identify the FAT32 partition (usually ~100-300MB). Select that volume ( sel vol X ) and assign it a letter ( assign letter=S ). Exit Diskpart and type: bcdboot C:\Windows /s S: /f ALL (Replace C: with your actual OS drive). 5. Additional Troubleshooting

Here’s a concise, step-by-step guide for Windows Server 2012 R2 boot repair .

1. Boot from Installation Media

Insert the Windows Server 2012 R2 DVD or a bootable USB with the same OS version. Boot from the media (you may need to change BIOS/UEFI boot order). windows server 2012 r2 boot repair

2. Access Repair Options

On the first screen, select your language and click Next . Click Repair your computer (bottom-left corner).

3. Open Command Prompt

Go to Troubleshoot → Command Prompt .

4. Run Bootrec Commands (Most Common Fix) Type these commands one by one, pressing Enter after each: bootrec /fixmbr bootrec /fixboot bootrec /scanos bootrec /rebuildbcd

If /rebuildbcd finds installations, type Y to add them. To repair the boot process for Windows Server

5. If Bootrec Fails → Rebuild BCD Manually Sometimes the BCD store is corrupted. Rename it and rebuild: bcdedit /export C:\BCD_Backup attrib C:\boot\bcd -s -h -r ren C:\boot\bcd bcd.old bootrec /rebuildbcd

6. Check Boot Sector & System Partition