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Windows 7: How to change bootmgr file name to oldbootmgr

01 Apr 2013   #1
lilal111

Windows Pro 64 Bit
 
 
How to change bootmgr file name to oldbootmgr

I am wondering how to change the bootmgr file name to oldbootmgr. This is part of an exercise to intentionally crash window on boot up. Can anybody help me with this?

Thanks!!


My System SpecsSystem Spec
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01 Apr 2013   #2
Dude

Windows 10 Pro X64
 
 

lilal111, you could try this

EasyBCD - NeoSmart Technologies
My System SpecsSystem Spec
01 Apr 2013   #3
gregrocker

 

You'd have to do it from WinRE using Command Line or accessing the file to delete using Copy & Paste - in Windows Recovery Console, or using a boot disk like Hirens which is not supported here. Save a Win7 backup image first in case it becomes irreparable.

All boot repair commands are automated in Win7 Startup Repair. It will actually rewrite the Win7 boot files to the Active partition when run Startup Repair - Run up to 3 Separate Times.

Perhaps we can save you the trouble by asking your questions here where we have dealt with countless thousands of these since before Win7 was even released.
My System SpecsSystem Spec
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02 Apr 2013   #4
Dude

Windows 10 Pro X64
 
 

lilal111, if you are playing with OS's I would also recommend you utilize virtual OS's.

Take a look at this thread. Virtualization - Windows 7 Help Forums
My System SpecsSystem Spec
02 Apr 2013   #5
nilank

 

@OP, you can do that using a linux distribution like Ubuntu (Home | Ubuntu). Make a bootable pendrive and boot using it. After you reach the Ubuntu desktop, open up file explorer (or 'computer', whatever it's called) from menus at top, navigate to the required location and rename the file you want. Now restart to see an unbootable Windows!
My System SpecsSystem Spec
02 Apr 2013   #6
Alejandro85

Windows 7 Ultimate x64
 
 

Just make hidden and system files visible in explorer (or any other file manager you use) and rename it, it works directly, only showing an UAC prompt and a lot of warnings since it's a critical system file, but it lets you rename afterwards, that's simple as it's not in use once the system boots.

The only problem you can have is that if you're using the hidden 100MB partition, bootmgr is located there instead, so you have to make that visible and assign a drive letter beforehand or use an external OS.

In any case, if you don't rename it back, Windows will no longer boot, I guess not even the F8 menu can show, but repairing it is a matter of renaming it back somehow.
My System SpecsSystem Spec
05 Apr 2013   #7
lilal111

Windows Pro 64 Bit
 
 

I would like to thank you all for your replies. Two of us had the one particular problem in the class where the instructors were not even able to figure it out.

After doing the correct alterations to the Folder options ofnow showing hidden files and unchecking the operating system files, bootmgr did not show up in the root of the C drive. It was a truly frustrating experience. Have any of you more seasoned experts ever come across this?
My System SpecsSystem Spec
05 Apr 2013   #8
gregrocker

 

Did you have another partiiton marked System such as the 100mb System reserved partition which the Windows 7 installer creates for the System boot files? The file should be on the partition marked System.
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 How to change bootmgr file name to oldbootmgr




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