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Causes of Error 400
Common Problems
Fix Error 400
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PC Support Guide
How To Fix Error 400
Causes of Error 400
Damaged registry files, malware, viruses, and corrupted data can result in Error 400 issues. These errors are often caused by improper maintenance of your system. If not fixed, this may lead to severe computer problems.
Common Symptoms
Error 400 error symptoms can include program lock-ups, slow PC performance, system freezes, startup and shut down problems, installation errors, and hardware failure.
Fixing the Problem
To ensure your PC is error free, it is highly recommended that you download and run the Error 400 repair tool PC Mechanic. It will fix problems that can create these errors and prevent new ones from occurring.
Download Error Repair Tool Download Repair Tool  (1.1 MB)
*File size: 1.1 MB, Download time: <1min (Cable/DSL)
Disclaimer: FixError.com is an authorized distributor of PC Mechanic. Support can also be provided by the manufacturer.
Click here to get help with 'Error 400'
Instructions
STEP 1:
Download & run PC Mechanic.

STEP 2:
Click 'Scan' to search for errors.

STEP 3:
Click 'Fix All' and you're done!
Fix Your Computer Now
Certified for Windows 8, 7, Vista & XP
  7 Comments on "How to Fix Error 400"

Benny says: Topic: Support 
This solved my problem!

coolio52 says: Topic: Support 
thanks for the help

SAMANTHA says: Topic: Support 
Just wanted to say thank you. This fixed a bunch of errors I was having.

Yankees4ever says: Topic: Support 
I didn't think it would work but it fixed the error 400 error.

EpicWin says: Topic: Support 
I can finally use my computer again without that annoying error message

DebbieG says: Topic: Support 
I was about ready to buy a new computer

ozgreat02 says: Topic: Support 
you are a life saver!

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