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How to Fix Error - 646?
Zs Sep. 12th, 2015
How to Fix 646 Error?
Item Info
Error Codes 646
Recommended Download 646 Error Fixer
File version 5.2
Size 4.5MB
Speed Up Your PC Free Performance Scan

646 Error Again? What Happened?

646, every time it pop up and froze my system. Sometimes this error: 0x80072F05 Windows 10 comes together with that error. Is there any connection between them my computer is becoming slower and slower. what's wrong?

- Kelsi Holoman

646 Error Again? What is Wrong with My Computer?

A problem has been detected and Windows has been shut down to prevent damage to your computer. The problem seems to be caused by 646.

Computer runs sluggishly and always seems to be ready to crash down

Download 646 Error Fixer Now!

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How to Fix 646 Error?

Manually editing the Windows registry

Manually editing the Windows registry in order to fix error 646 is certainly not recommended unless you are PC service professional. Incorrectly editing your registry can stop your PC from functioning and create irreversible damage to your own operating system. In fact, just one misplaced comma can prevent the PC from booting entirely!


Caution: Unless you an advanced PC user, we Not recommend editing (blank) Windows registry manually. Using Registry Editor incorrectly can produce serious issues that may require you to reinstall Windows. We do not promise that problems resulting from the incorrect use of Registry Editor can be solved. Work with Registry Editor at your own risk.

To manually repair your Windows registry, first you need to create a backup by exporting a portion of the registry related to MACHINE_CHECK_EXCEPTION (eg. Windows Operating System):

  • Click the Start button.
  • Type "command" in the search box... DO NOT hit ENTER yet!
  • While holding CTRL-Shift on your keyboard, hit ENTER.
  • You will be prompted with a permission dialog box.
  • Click Yes.
  • A black box will open with a blinking cursor.
  • Type "regedit" and hit ENTER.
  • In the Registry Editor, select the Error 0x9C-related key (eg. Windows Operating System) you want to back up.
  • From the File menu, choose Export.
  • In the Save In list, select the folder where you want to save the Windows Operating System backup key.
  • In the File Name box, type a name for your backup file, such as "Windows Operating System Backup".
  • In the Export Range box, be sure that "Selected branch" is selected.
  • Click Save.
  • The file is then saved with a .reg file extension.
  • You now have a backup of your MACHINE_CHECK_EXCEPTION-related registry entry.

Check Event Viewer

Check the System and Application logs in Event Viewer for errors or warnings that might provide more clues on the cause of error 646.

How to Fix 646 Error with SmartPCFixer?

1. Download Error Fixer. Install it on your system.

error fixer

2. After the scan is done, you can see the errors and problems need to be repaired. Click Fix All.

registry cleaner

3. The Repair part is finished, the speed of your computer will be much higher than before and the errors have been fixed. You can also use other functions in this software. Like dll downloading, windows updating and print spooler error repair.

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Tagged: 646, How to fix error 646

Comments (33)

What People Say: (About 646)

Works like a charm! FIFA 14 started to work again! Time to challenge my friends. THANK YOU!

by Dave Kelley Sep.22nd

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