Over 100,000,000 Wonderful Users
Most recommended methods to deal with -- 5.1.0 – Unknown Error 554
Applies To: Windows 10 | Windows 8 | Windows 7 | Windows Vista | Windows XP


We must first understand what may cause the pc to work slowly? There are several key words here: virus, evidence files, junk files, registry errors, etc.There are many methods to fix those issues and can be easily searched on the internet, but some of them are complicated which may require you technical skills. When talk about easy ways to fix common computer errors, today we will provide an simple solution -- 5.1.0 – Unknown Error 554 Repair Tool.


5.1.0 – Unknown Error 554 is surely an problem that occurs when an unforeseen condition appears or whenever a wanted operation has went wrong. Once you have an error in Windows, it may be serious and lead your programs to freeze and crash or it could be seemingly inoffensive yet resenting.


There could be numerous reasons for 5.1.0 – Unknown Error 554 error, such as:

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

Download the Windows repair tool

Recommend: It is easy to repair windows errors like 5.1.0 – Unknown Error 554 by applying SmartPCFixer with simple clicks. Download it now and follow below instructions to fix the errors, besides, it can also increase your system speed and maximize PC performance.

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 Error 554 automatically?
  • 1. Click the below download button to get 5.1.0 – Unknown Error 554 Error Fixer.
  • 2. Start the Smart PC Fixer software and make a all-inclusive scan for the computer or laptop.
  • 3. Click [ Fix All ] to get rid of the "5.1.0 – Unknown Error 554". Download SmartPCFixer here.

How to fix 5.1.0 – Unknown Error 554 Manually ?
Step 1, uninstall recent installed app:
Open "Programs and Features" via Ctrl + Esc, clicking Control Panel, clicking Programs, and then clicking "Programs and Features".
Select a program, and then click Uninstall.
Step 2. Run SFC to fix 5.1.0 – Unknown Error 554 error.
  • Click "Start" button;
  • Type "cmd" or "Command Prompt" in the searching box, right click the "cmd.exe" in search result, and click "Run as administrator";
  • Type SFC /SCANNOW in the command window;
  • Press ENTER.

Notice: SFC also named System File Checker, it is an utility in windows that permits users to check for corruptions in windows system files and repair damaged files.Do not close this Command Prompt window till the verification is 100% complete. The scan results will be shown when this process is finished.

Step 3, check if "5.1.0 – Unknown Error 554" was removed.
Run your pc under safe mode, and then you probably receive message from system about whether your error being successfully fixed. If not, you should apply other solution -- "5.1.0 – Unknown Error 554" repairing tool.

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.