Windows 7 does not start error 0x0000007F

Question

Hi;

i was using Windows 7 ultimate and upgraded to 10. But 10 was crashing frequently and was incompatible with my printer (did everything that could solve the problem). Finally i decided to downgrade to 7 and chose to go back to previous build. It said "Restarting" and took more than 6hrs and finally started showing windows 7 starting. But it can't start. i tried to repair by w-7 DVD, still unable. 

when it starts, it shows me error code 0x0000007F ....... 

any help! thanks

Answer 1

Hello Misganu,

I would like to know some information about the issue so that we could help you better.

1. What is the complete error message when you say, "error code 0x0000007F"?
2. What is the make and model of your computer?

I appreciate you for providing details about the issue and your efforts towards resolving it.

I also realize the inconvenience you are experiencing due to 0x0000007Ferror issue. I will certainly help you.

The UNEXPECTED_KERNEL_MODE_TRAP bug check has a value of 0x0000007F. This bug check indicates that the Intel CPU generated a trap and the kernel failed to catch this trap.

Bug check 0x7F typically occurs after you install a faulty or mismatched hardware (especially memory) or if installed hardware fails.

I would suggest you to use steps provided in this article and check if it helps.

Refer:

Bug Check 0x7F: UNEXPECTED_KERNEL_MODE_TRAP

https://msdn.microsoft.com/en-us/library/ff559244(v=VS.85).aspx

Important Notes:

Modifying BIOS/ complementary metal oxide semiconductor (CMOS) settings incorrectly can cause serious problems that may prevent your computer from booting properly. Microsoft cannot guarantee that any problems resulting from the configuring of BIOS/CMOS settings can be solved. Modifications of the settings are at your own risk.

Antivirus software can help protect your computer against viruses and other security threats. In most cases, you shouldn't disable your antivirus software. If you have to temporarily disable it to install other software, you should re-enable it as soon as you're done. If you're connected to the Internet or a network while your antivirus software is disabled, your computer is vulnerable to attacks.

When you use System Restore to restore the computer to a previous state, programs and updates that you installed are removed.

I hope this information helps.

Please do let us know if you need any further assistance.

Thank you

Answer 2

Hello Stefano,

Thank you for your response.

I appreciate your time.

I would suggest you to run Bootrec commands and check if Windows boots.

Refer this article:

Use Bootrec.exe in the Windows RE to troubleshoot startup issues

https://support.microsoft.com/en-us/kb/927392

Please keep us updated.

Thank you

Answer 3

Acer Veriton M275

I have the same problem. Error is 0x0000007F. After restore previous operating system the error appear. There is no way to fix the problem. Safe mode doesn't run, system restore fail to load. Frustrating.