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Most helpful solution to get rid of -- 5.1 0 Unknown Address Error 554
Applies To: Windows 10 | Windows 8 | Windows 7 | Windows Vista | Windows XP


Windows along with other critical errors may appear as soon as your Windows platform becomes corrupted. Opening programs will be slower and reaction time will lag. If you have numerous applications running, you could possibly encounter crashes and freezes. For example, you may receive 5.1 0 Unknown Address Error 554 errors when your computer is not stable.


In most situations, 5.1 0 Unknown Address Error 554 issue arises when your pc system is not stable and critical system files fail to respond or are getting missing. 5.1 0 Unknown Address Error 554 error happens if your system lack of regular maintenance. To decrease further damage, it is important to remove this error immedately.


There may be various reasons for 5.1 0 Unknown Address Error 554 error, list as below:

  • excessive startup entries
  • registry errors
  • hardware/RAM decline
  • fragmented files
  • unneeded program installations, etc

Download the Windows repair tool

Manually settling the 5.1 0 Unknown Address Error 554 error might be scary job for orandinary people who is not very good at computer. Using this method to avoid the error you need to analyse every possibilities and test them one by one until you encounter the correct method. The easiest way is applying an automatic fixing tool, such as SmartPCFixer. For detailed fixing process please follow below content.

File Size: 6 MB
Compatible: Windows XP, Vista, 7 (32/64 bit), 8 (32/64 bit), 8.1 (32/64 bit), 10
License: Free evaluation version. To unlock all features and tools, a purchase is required.
Downloads: 361,927
How to fix 5.1 0 Unknown Address Error 554 automatically?

How to fix 5.1 0 Unknown Address Error 554 Manually ?
Step 1, uninstall recent installed application:
Select "Programs and Features" through click windows "Start" button, clicking Control Panel, clicking Programs, and then clicking "Programs and Features".
Select a program, and then click Uninstall.
Step 2, Run System File Checker to fix "5.1 0 Unknown Address Error 554" error:
  • Click "Start" button;
  • Type "Command Prompt" in search box, right click and "Run as administrator";
  • Type SFC /SCANNOW in the command window;
  • Press ENTER.

Note: System File Checker is a tool in windows that allows customers to check out for corruptions in windows system data files and restore corrupted data files.Don't close this Command Prompt window till the verification is 100% complete. The scan results will be shown after this process is finished.
Step 3. After above steps, you will receive system messages that inform you system files are fixed successfully. Or if you are told there are still other problems need to be removed, then it will be better to try an automatic fixing tool -- Error Fixer.

Warm Tips
  • You must run as an administrator, no matter what steps you will do about your PC.
  • Depending on your computer windows system, the above steps may be slightly different, but the basic process is mostly the same.