2. Use Automatic Repair to repair Windows 10/8 UEFI
Jul 03, 2017 To restore the Master Boot Record, type the following command and hit Enter. This command writes a new Windows-compatible Master Boot Record (based on whatever version of Windows you’re using) to the boot sector without overwriting the existing partition table. It’s a good start for repairing boot loader errors resulting from file corruption. How To Rebuild System Reserved Partition From Scratch. System reserved partition is a small (100 MB) non-NTFS partition containing Windows Boot Loader and its configuration (BCD registry hive). This article provides effective methods and detail guide for you to fix computer UEFI boot for Windows 10/8/7 with ease. If you are having problems with UEFI bootloader and fail to boot your Windows 10/8/7 system, follow to find a solution and fix this problem with ease.
In this article, you'll find step-by-step methods to guide you fix computer UEFI boot errors in Windows 10/8/7. No matter you are a new Windows 10 insider user or a loyal Windows 8 or 7 fans, if you are having problems with UEFI boot on your PC, just relax. And you may directly follow offered steps below to fix UEFI boot in Windows 10/8/7 with ease now.
Apr 07, 2010 How to Fix Windows 7 When It Fails to Boot. This should take you to the Command Prompt in the Windows Recovery Environment. Step two: Type DiskPart and then press Enter. Step three: Type List Disk now and then press Enter. This command will list all disks attached to your computer and assign them a disk number. I only have Windows 7 installed. I accidentally deleted the System Reserved Partition and now I can no longer boot into Windows 7. The installation of Windows and all my files still exist in the partition, but without the System Reserved Partition I can no longer boot.
Method 1. Use Diskpart to Fix UEFI Boot Error in Windows 10/8/7
If you are a Windows 10 or 8 user and you prefer free methods to fix UEFI boot error, you may follow below two solutions to solve this issue now:
1 - Enter Command Prompt from Advanced options
Step 1: Insert Windows 10/8/7 installation disk or installation USB into PC > Boot from the disk or USB.
Step 2: Click Repair your computer or hit F8 at the Install now screen.
2 - Run Diskpart to set partition ID and assign drive letter
Step 1: Type below command and hit Enter each time:
diskpart
list disk
sel disk 0
Step 2: When the message 'Disk 0 is now the selected disk' shows up, type: list vol and hit Enter.
Diskpart will now show the full list of volumes on your PC, find UEFI volume from the list: UEFI partition will be on Volume 2.
Step 3: Type below command and hit Enter each time:
sel vol 2
set id=c12a7328-f81f-11d2-ba4b-00a0c93ec93b
Or SET ID=ebd0a0a2-b9e5-4433-87c0-68b6b72699c7
Step 4: Assign drive letter by typing below command and click Enter:
assign letter=G: (Note: G shall be a unique drive letter which cannot be already used.)
3 - Repair the Boot Record
Step 1: Open Command Prompt as administrator, enter below command:
cd /d G:EFIMicrosoftBoot
Note: G is the drive letter you signed to UEFI partition and remember to replace G with UEFI's partition letter.
Enter: exit when the process completes.
Step 2: To repair the Boot Record, open CMD and enter below command line:
bootrec /fixboot
Free Boot Disk Windows 7
Enter: exit when the repair process completes.
4 - Rebuild the BDC Store
Step 1: Type each command line and hit Enter each time:
ren BCD BCD.old
bcdboot C:Windows /1 en-us /s G: /f ALL (Note: c: is the drive where Windows 10/8.1/8 is installed on.)
Step 2: Type: exit in Command Prompt when the process completes and then restart your PC.
Now UEFI boot is fixed and Windows 10/8/7 can be boot up on your PC again.
Method 2. Use Automatic Repair to repair Windows 10/8/7 UEFI
Windows Automatic Repair is a built-in tool for users to apply and try to fix some normal errors on Windows PC. And you may also try this method to repair Windows 10, 8 or 7 UEFI/EFI boot error:
1- Boot up Windows from Installation media
Step 1: Insert Windows 10/8/7 installation disk or USB to your PC.
Step 2: Restart PC and boot from the disk or USB.
2 - Enable Automatic Repair option
Step 1: Click Repair your computer at the Install now screen.
Step 2: Click Troubleshoot at Choose an option screen > Click Automatic Repair.
Rebuild Windows 7 Boot Partition Windows 10
Step 3: Choose an account from the list to continue at the Automatic Repair screen and wait for the process to finish.
When the process completes, you can restart your PC and then you should be able to use your computer without any problems again.
Final Word
UEFI boot error frequently occurs to Windows 10, 8 and some Windows 7 users. If you have come across such a problem, relax and follow the provided two methods on this page to get rid of this issue.