Solved BSOD boot loop after downgrading from Windows 10 to Windows 7

[pauliux963]

So as the title says, I decided to downgrade my windows to 7 again, everything went smoothly. PC restarted and I was greeted by a BSOD, it restarted, BSOD again and so on. Tried startup repair, no use (failed with 0x490 code, if thats any use), tried boot windows to last good configuration, same. I still havent tried chkdsk. I can boot into safe mode but I cant manage to get my mouse and keyboard work.
BSOD code: STOP 0x0000007e (0xffffffff80000003, 0xfffff880223912d, 0xfffff880009a9328, 0xfffff880009a8b80)

 

[pauliux963]

And I if someone would help me get my mouse and keyboard working in safe mode I could get the logs and post them here

 

[pauliux963]

Strange, I decided to check the C and D drives via cmd in the system recovery options (by using the "dir"command) and it showed that C drive is empty and D drive has the C drive's folders, including the windows folder. Im doing the chkdsk for the D drive since the C drive chkdsk finished in few seconds.

 

[Laith]

Hiya and welcome to SevenForums!rb:

Hmm, can you copy over the files from D: to C: using an setup commandprompt?

 

[pauliux963]

Hiya and welcome to SevenForums!rb:

Hmm, can you copy over the files from D: to C: using an setup commandprompt?

I dont know how, but I will get my windows disk from my other house and try to reinstall my windows, I will check back how it went

 

[Laith]

Okay.

 

[pauliux963]

Ok I cant find my windows disk... So what about the file transfering?

 

[Laith]

Actually, skip the commandprompt. Can you burn an linux distro and boot from that and transfering the files? My plan was to transfer the files via the commandprompt but can you do that?

 

[pauliux963]

No need, I fixed it by copying Regback contents. And now another problem, keyboard and mouse dont work, just like in safe mode tho it works in BIOS setup.

 

[Laith]

Hmm, this is probably because it dosen't have the right drivers. You need to find the right drivers for your mouse and keyboard.

 

[pauliux963]

Hmm, this is probably because it dosen't have the right drivers. You need to find the right drivers for your mouse and keyboard.

I reconnected my mouse to the USB port, the drivers installed but it still doesnt work

 

[Laith]

Hmm, restart the computer?

 

[pauliux963]

Same :/

 

[Laith]

I think you'll have to re-install. That's your last resort.

 

[pauliux963]

I think you'll have to re-install. That's your last resort.

Yeah, thats for the best. The downgrade probably messed up my registry.

Thank you!

 

[Laith]

Yup it did mess up the registry really bad i think.
No problem! It's my duty to help!

 

[skidkid]

I got the same issue

I have the same issue

onlye I had to bend over backwards to create a bootable windows USB drive with the installation to be able to get in and run command line steps to restore the keyboard and mouse activity from the registry

still working on isolating the 'driver' or whatever the cause is

I was able to regain mouse and keyboard control again after doing the following:

- create a USB bootable windows installer flash drive
- run recovery options
- go to run command line
- run regedit.exe
- click on any of the HKEY options
- select file -> load hive
- load the both the software and system hives, (name it to windowssoftware and windowssystem)

look for the following:

ControlSet001\Control\Class\{4D36E96B-E325-11CE-BFC1-08002BE10318}
AND
ControlSet002\Control\Class\{4D36E96B-E325-11CE-BFC1-08002BE10318}

- Look for a REG_MULTI_SZ value titled UpperFilters. If it doesn't exist, create it.

- Edit the value UpperFilters to read kbdclass. If there are any other line items in UpperFilters, delete them. (note that sometimes the upperfilter will be there, but the kbdclass description won't be. This will cause a failure to load.)

- Navigate down a bit to ControlSet001\Control\Class\{4D36E96F-E325-11CE-BFC1-08002BE10318}
AND
ControlSet002\Control\Class\{4D36E96F-E325-11CE-BFC1-08002BE10318}

-Look for a REG_MULTI_SZ value titled UpperFilters. If it doesn't exist, create it.

= Edit the value UpperFilters to read mouclass. If there are any other line items in UpperFilters, delete them. (as with the keyboard, if the class isn't there it won't work)


I still need to work out the issue with the 0x7e error though, still can't get normally into windows, only safe mode, and only regained access to mouse and keyboard using that method, if you guys got a way to work around it please do so...

I'm getting this from the windows system event logs:

The Computer has rebooted from a bugcheck. The bugcheck was: 0x0000007e
(0xffffffff80000003, 0xfffff8800570b0f5, 0xfffff880009a9328, 0xfffff880009a8b80) A dump was
saved in: C:\Windows\MEMORY.DMP.ReportId: 080815-7425-01

let me know if there is something I can grab for you to help out

 

[pauliux963]

I checked and every value is already set corretly as you mentioned above. Thats not the case probably. Anyway, I installed new installation of WIndows 7 on another partition and everything seems normal. I will be doing full-wipe reinstall tomorrow, got Windows 8 so I'll try that.

 

[Laith]

That's good to hear.

 

[MetaForr]

Many thanks to Skidkid! Your Keyboard and Mouse registry settings helped tremendously. I was receiving the 0x7e error also, after downgrading the desktop from Windows 10. I was able to replace the registry files in the c:\windows\system32\config folder with the backups in the c:\windows\system32\config\regback folder to get the computer to boot in to normal windows.

I hope that works for you as well.

Thanks,
Tim.