4 Ways Helps to Fix BOOTMGR Is Compressed in Windows 10/8/7

Computer issues always happen unexpectedly. Sometimes when starting up Windows 10/8/7, you get an error message to block you from loading to the desktop, for example, a blue screen error code, hard drive error, Windows system error, etc. Today, we will introduce you BOOTMGR error – BOOTMGR is compressed.

BOOTMGR refers to Windows Boot Manager which is important for Windows to function perfectly. If it is compressed, Windows will fail to load and start up although file compression is a great function. When getting the error “BOOTMGR is compressed”, you may choose to press Ctrl+Alt+Del for a restart. This will take you to the same error interface.

Fortunately, you can try some ways below to fix the compressed BOOTMGR error.

How to Fix BOOTMGR Is Compressed Windows 10/8/7

1. Run Startup Repair to Repair BOOTMGR

Startup Repair is one of the recovery tools in Windows used to fix system problems that might block Windows from booting successfully. When getting the BOOTMGR compressed issue, you can run this tool.

How to access Startup Repair in Windows 10/8/7? The operations are a bit different.

In Windows 10, you can force restart the PC several times to enter Windows Recovery Environment (WinRE). Then, go to click Advanced options from the Automatic Repair interface. Then, go to Choose an option > Troubleshoot > Advanced options > Startup Repair.

In Windows 7, you can press F8 before seeing the Windows logo during a reboot to enter Advanced Boot Options and choose Repair Your Computer to enter the System Recovery Options window. Then, click Startup Repair to start a fix.

Or you can prepare an ISO file of Windows 10/8/7, burn it to a USB drive and boot the PC from that drive. Then, click Repair your computer to enter WinRE for a startup repair.

2. Update BOOTMGR Manually

Updating BOOTMGR to replace the compressed file with the correct one can be a good solution to fix the issue of BOOTMGR is compressed. This also required you to boot the PC to WinRE, just follow the instructions in method 1.

Step 1: Open Command Prompt from the recovery mode in Windows 10/8/7.

Step 2: Type in bcdboot C:\Windows /s D:\ and press Enter to execute this command. C means a system drive and D is an active boot partition. Replace them with the ones based on your situation.

3. Rebuild Boot Configuration Data (BCD) File

When getting the compressed BOOTMGR error, you can also try to rebuild the BCD file since the corruption can lead to an unsuccessful boot with the issue.

Step 1: Launch Command Prompt in WinRE.

Step 2: Execute these commands in the CMD window:

bootrec /fixmbr

bootrec /fixboot

bootrec /rebuildbcd

4. Uncheck Compress This Drive

Sometimes a compressed hard drive can lead to “BOOTMGR is compressed press Ctrl+Alt+Del to restart” when booting Windows 10/8/7. You should uncompress it by following the instructions below.

Step 1: Open Command Prompt.

Step 2: Type a command to access Safe Mode:

Safe Mode: bcdedit /set {default} safeboot minimal

Safe Mode with Networking: bcdedit /set {default} safeboot network

Safe Mode with Command Prompt: bcdedit /set {default} safebootalternateshell yes

Step 3: Open Windows Explorer, right-click on C, and choose Properties.

Step 4: Uncheck Compress this drive to save disk space from the General tab.

After trying these solutions, you should easily remove the error message “BOOTMGR is compressed press Ctrl+Alt+Del to restart” from your PC and you can use the machine as normal. After that, we recommend backing up your computer.

Back up Windows with MiniTool ShadowMaker

You know, system issues often appear due to some reasons, letting you annoyed. If you don’t have many skills or computer knowledge, you don’t know how to fix them. Although you find solutions, it is time-consuming to troubleshoot issues. Sometimes, what you do cannot work. Thus, after fixing compressed BOOTMGR, you had better create a backup for your Windows 10/8/7 PC.

Once your system goes wrong, you can quickly restore it to an earlier normal state. This reduces the downtime. To back up your PC, we recommend using MiniTool ShadowMaker – a professional backup software used to create a system image, back up files, folders, disks, and partitions, sync files/folders, and clone a hard drive.

Just get this software from its official website, launch it and go to Backup or Sync, choose backup source & destination and run the backup task. The operations are simple if you follow the prompts on the screen.