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BSOD : Windows 10 wont boot after deleting registry key

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BSOD : Windows 10 wont boot after deleting registry key

Unread postby Johndoe225 » June 21st, 2019, 3:46 pm

Hello guys,
I did something bad.
There is a registry entry in the CurrentControlSet that I deleted. HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run or HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run .... I dont remember which one.
Since I deleted this entry, windows refuses to start again.
I tried system restore ; system reinstall.... none worked. I get a BSOD
Can you help me ?
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Re: BSOD : Windows 10 wont boot after deleting registry key

Unread postby mAL_rEm018 » June 21st, 2019, 4:34 pm

Hello Johndoe225, :)

Although I'm no expert in BSODs, I will try to help you as best as I can. First off, you shouldn't play in the Windows Registry unless you know what you're doing and have made a backup. May I ask why you removed an entry from your Registry?

You mentioned BSOD... Do you have any error code? If it's easier, you can take a picture of the BSOD an upload it here.

Regards,
mAL
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Re: BSOD : Windows 10 wont boot after deleting registry key

Unread postby Johndoe225 » June 21st, 2019, 5:40 pm

mAL_rEm018 wrote:Hello Johndoe225, :)

Although I'm no expert in BSODs, I will try to help you as best as I can. First off, you shouldn't play in the Windows Registry unless you know what you're doing and have made a backup. May I ask why you removed an entry from your Registry?

You mentioned BSOD... Do you have any error code? If it's easier, you can take a picture of the BSOD an upload it here.

Regards,
mAL


Thank you for the quick reply.
The BOSD error is : Ox000021a
Who removed the entry from the Registry ? : Autorun (from Sysinternals) I just picked the registry listed there and deleted it from Autorun. After I deleted I checked Regedit ; the entry was gone (I was so proud of myself :oops: .... not so much now :( )

Aprat from what I said in my OP I also tried the followings :

sfc /scannow ---> This goes to 100% but says after "resource protection could not perform the requested operation "
I tried : Dism /Online /Cleanup-Image /CheckHealth --> This sais /Online is not an option of DISM . Therefore I gave up on that option

Lastly I just tried a solution at Bleeping to restore registry https://www.bleepingcomputer.com/forums ... ?p=4371456
This did not work either
Here what the solution said :
Open a cmd prompt and type :- (type cmd's exactly as you see here, syntax is important)



bcdedit | find "osdevice"



(press enter, the | is called a pipe and is above the \ key), it will return ...OS device partition...X (where X is a drive letter) use this letter in the following cmd's. Often in 10 this will be D (do not worry if C: drive is the normal OS drive things work differently here, we will use D in this example)



Next type:-



D: (press enter)



Next type:-



cd D:\Windows\System32\ Config (press enter)



Next type:-



Dir (press enter)



The contents of the system32 \config file will open, if the regback date, is before this happened, then continue (if not you have lucked out)



Next type:-



cd regback (press enter)



Next type:-



copy *.* D:\windows\system32\config (press enter)



Type:- ALL to the proceed prompt, that's it, the registry has been restored to the date of the regback, see how you go.
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Re: BSOD : Windows 10 wont boot after deleting registry key

Unread postby mAL_rEm018 » June 21st, 2019, 6:17 pm

Hello Johndoe225,

Thank you for the information! It's getting quite late over here. I will do some research tomorrow and post some instructions. :)

Regards,
mAL
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Re: BSOD : Windows 10 wont boot after deleting registry key

Unread postby Johndoe225 » June 21st, 2019, 6:43 pm

mAL_rEm018 wrote:Hello Johndoe225,

Thank you for the information! It's getting quite late over here. I will do some research tomorrow and post some instructions. :)

Regards,
mAL


Hopefully you'll get back at me quick. I was told to go to our company support team for a complete reinstall if I could not fix it by myself. So next post is like a hit or a miss for me ;)
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Re: BSOD : Windows 10 wont boot after deleting registry key

Unread postby mAL_rEm018 » June 21st, 2019, 6:49 pm

I completely understand. Is this a business computer?
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Re: BSOD : Windows 10 wont boot after deleting registry key

Unread postby Johndoe225 » June 21st, 2019, 7:05 pm

mAL_rEm018 wrote:I completely understand. Is this a business computer?


Gotta be honest. Yeah it is. But I got lot of flexibility here though. Unless MRU does not fix business computers
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Re: BSOD : Windows 10 wont boot after deleting registry key

Unread postby mAL_rEm018 » June 21st, 2019, 7:15 pm

Johndoe225 wrote:
mAL_rEm018 wrote:I completely understand. Is this a business computer?


Gotta be honest. Yeah it is. But I got lot of flexibility here though. Unless MRU does not fix business computers

Thank you for your honesty. :) We only help with home computers for various reasons, so we don't fix business computers here, but you can try posting at the following forum: https://www.bleepingcomputer.com/forums ... d-support/ I've linked you directly where you should post if you ask for help there. They offer help for business computers.

Regards,
mAL
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Re: BSOD : Windows 10 wont boot after deleting registry key

Unread postby Johndoe225 » June 21st, 2019, 7:25 pm

mAL_rEm018 wrote:
Johndoe225 wrote:
mAL_rEm018 wrote:I completely understand. Is this a business computer?


Gotta be honest. Yeah it is. But I got lot of flexibility here though. Unless MRU does not fix business computers

Thank you for your honesty. :) We only help with home computers for various reasons, so we don't fix business computers here, but you can try posting at the following forum: https://www.bleepingcomputer.com/forums ... d-support/ I've linked you directly where you should post if you ask for help there. They offer help for business computers.

Regards,
mAL


Thanks friend.
Just tell me one thing though : is it fixable ? (didn't wanna waist the week end on google that's why I came directly here)
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Re: BSOD : Windows 10 wont boot after deleting registry key

Unread postby mAL_rEm018 » June 22nd, 2019, 6:35 am

Johndoe225 wrote:Thanks friend.
Just tell me one thing though : is it fixable ? (didn't wanna waist the week end on google that's why I came directly here)

I specialize in malware removal and my experience with BSODs is limited, so I can't really answer your question. There are experts in BSODs at Bleeping Computer that will be able to better assess the situation.

Given that this is a work computer, I will go ahead and close this topic.
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