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Danger level 9
Type: Rogue Anti-Spyware
Common infection symptoms:
  • Installs itself without permissions
  • Connects to the internet without permission
  • Slow internet connection
  • System crashes
  • Annoying Pop-up's
  • Slow Computer
Other mutations known as:

Windows Diagnostic

With all the sophistication invested in the development of rogue defragmenter tools, it can be difficult to distinguish between genuine defraggers and harmful, rogue applications such as the malicious Windows Diagnostic. This rogue in particular is nothing more than a seditious application designed to act as a vessel for unscrupulous criminals to rip honest consumers off. This rogue will try everything in its power to come across as a genuine application, but at the end of the day Windows Diagnostic, which emanates from the same despicable family of rogues as Fake HDD and Windows Tool, does not have the abilities it professes to and will be the cause of much more problems to your PC than it will any good.

Windows Diagnostic enters the system surreptitiously through using seditious Trojans. These Trojans are distributed via fake online malware scanners and annoying browser hijacking web domains. Windows Diagnostic has also been known to bundle its Trojans and malware with other genuine security updates and downloads obtained from third party websites.

Download Spyware Removal Tool to Remove* Windows Diagnostic
  • Quick & tested solution for Windows Diagnostic removal.
  • 100% Free Scan for Windows

Because Windows Diagnostic’s infiltration of the PC is virtually undetectable by the user, he will have a lot of trouble to get rid of Windows Diagnostic without help. The first clue the user will have as to the presence of this rogue on his system will come from being spammed by various fake system notifications. These false alerts were designed to panic the user into thinking his system is operating less than optimally. The truth is all of the alerts are fake and falsely generated by Windows Diagnostic in an effort to force the user into paying for worthless software. Do not pay any attention to it, and be on the lookout for the following fake alerts:

Hard Drive Failure
The system has detected a problem with one or more installed IDE / SATA hard disks. It is recommended that you restart the system.


System Error
An error occurred while reading system files. Run a system diagnostic utility to check your hard disk drive for errors.


Critical Error
Hard drive critical error. Run a system diagnostic utility to check your hard disk drive for errors. Windows can\'t find hard disk space. Hard drive error.

Fix Disk
Windows Diagnostic Diagnostics will scan the system to identify performance problems.
Start or Cancel

Windows Diagnostic Diagnostics
Windows detected a hard disk error.
A problem with the hard drive sectors has been detected. It is recommended to download the following sertified software to fix the detected hard drive problems. Do you want to download recommended software?

Requested registry access is not allowed. Registry defragmentation required
Read time of hard drive clusters less than 500 ms
32% of HDD space is unreadable
Bad sectors on hard drive or damaged file allocation table
GPU RAM temperature is critically high. Urgent RAM memory optimization is required to prevent system crash
Drive C initializing error
Ram Temperature is 83 C. Optimization is required for normal operation.
Hard drive doesn\'t respond to system commands
Data Safety Problem. System integrity is at risk.
Registry Error - Critical Error

Download Spyware Removal Tool to Remove* Windows Diagnostic
  • Quick & tested solution for Windows Diagnostic removal.
  • 100% Free Scan for Windows

Critical Error!
Damaged hard drive clusters detected. Private data is at risk.

Critical Error
Hard Drive not found. Missing hard drive.

Critical Error
RAM memory usage is critically high. RAM memory failure.

Critical Error
Windows can\'t find hard disk space. Hard drive error

Critical Error!
Windows was unable to save all the data for the file \\System32\\496A8300. The data has been lost. This error may be caused by a failure of your computer hardware.

Critical Error
A critical error has occurred while indexing data stored on hard drive. System restart required.

System Restore
The system has been restored after a critical error. Data integrity and hard drive integrity verification required.

Activation Reminder
Windows Diagnostic Activation
Advanced module activation required to fix detected errors and performance issues. Please purchase Advanced Module license to activate this software and enable all features.

Low Disk Space
You are running very low disk space on Local Disk (C:).

Windows - No Disk
Exception Processing Message 0x0000013

If you want to \"activate\" Windows Diagnostic on your PC, then simply enter the following activation key:


At the end of the day Windows Diagnostic is not what it appears to be. This is a rogue application not interested in living up to any of its over inflated promises, but simply to rip you off. In order to take back your PC and restore its security and privacy delete Windows Diagnostic without waiting another moment. This can be best achieved by investing in a powerful and genuine security tool which will also protect your PC against similar future attacks and threats.

Download Spyware Removal Tool to Remove* Windows Diagnostic
  • Quick & tested solution for Windows Diagnostic removal.
  • 100% Free Scan for Windows

How to manually remove Windows Diagnostic

Files associated with Windows Diagnostic infection:

Windows Diagnostic.lnk
Uninstall Windows Diagnostic.lnk
%UserProfile%\Start Menu\Programs\WindowsDiagnostic\WindowsDiagnostic.lnk
%UserProfile%\Start Menu\Programs\WindowsDiagnostic\Uninstall WindowsDiagnostic.lnk
%UserProfile%\Start Menu\Programs\WindowsDiagnostic\
%AllUsersProfile%\Application Data\[random].exe
%AllUsersProfile%\Application Data\[random].dll

Files associated with Windows Diagnostic infection (Win7, Vista):

%UserProfile%\Start Menu\Programs\WindowsDiagnostic\WindowsDiagnostic.lnk
%UserProfile%\Start Menu\Programs\WindowsDiagnostic\Uninstall WindowsDiagnostic.lnk
%UserProfile%\Start Menu\Programs\WindowsDiagnostic\

Windows Diagnostic DLL's to remove:


Windows Diagnostic processes to kill:


Remove Windows Diagnostic registry entries:

HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Download "CheckExeSignatures" = 'no'
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main "Use FormSuggest" = 'yes'
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Associations "LowRiskFileTypes" = '/{hq:/s`s:/ogn:/uyu:/dyd:/c`u:/bnl:/ble:/sdf:/
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Attachments "SaveZoneInformation" = '1'
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run "[random]"
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run "[random].exe"


  1. Sam Taylor Mar 20, 2011

    part of the affect this had was I was unable to connect to the internet. fortunately, i had an older laptop I could connect and check this very strange newly arrived windows diagnostics.
    I was unable to save the entire file to a usb drive to be able to use on the other computer.
    I would have paid alot for that - as I've already wated 5 hours today with a computer that just keeps rebooting and aren't progressing very far.

  2. Pcthreat Mar 22, 2011

    Sam Taylor,

    What do You mean by "I was unable to save the entire file to a usb drive"
    The installation file is only 1 MB size. It should definitely fit in any USB drive.

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