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How to remove Windows Efficiency Manager virus

Windows Efficiency Manager is a fake security tool that disables legitimate antvirus applications, blocks Windows programs from running and displays fake security alerts. It hides under the name of Microsoft Windows and pretends to be a legitimate malware removal tool. As all rogueware applications from same family, it is promoted and distributed with the help of Microsoft Security Essentials Alert trojan. The trojan will display false information that states “Unknown Win32/Trojan was detected on your computer” and then suggest you to perform a scan of your PC. Once the scan is complete, it will report that a program is infected with Trojan.Horse.Win32.PAV.64.a and prompt you to install Windows Efficiency Manager to cure your computer. Remember, this fake antivirus is unable to detect or rid your system of parasites nor will be protect you from legitimate future threats, so you should never trust in anything related to this application! You need to remove Windows Efficiency Manager from your computer as quickly as possible!

During installation, this malware makes itself start every time when your computer boots up. After the installation is done, it will reboot your computer. When Windows is loaded, you will be shown the Windows Efficiency Manager prompt instead of Windows desktop. But there is no any choice, only “OK” button is active. After click to it, WindowsEfficiencyManager will perform a fake scan of your computer and list a lot of infections to trick you into thinking your PC in danger. It will report that was able to clean the majority of infected files, but was not able to cure a few important Windows files and offer to purchase its full version to clean them. However, the scan results is a scam, because the program is neither able to detect, nor to remove anything from your computer, especially viruses or other kind of malware. Thus, do not pay for the bogus software, simply ignore all that the fake antivirus will display you.

While the rogue is running, it will display numerous fake warnings and block legitimate Windows applications on your computer. The following warning will be shown when you attempt to run Task Manager:

Name: taskmgr.exe
Name: C:\WINDOWS\taskmgr.exe
Application that seems to be a key-logger is detected. System information security is at risk. It is recommended to enable the security mode and run total System scanning.

Just like false scan results above, all of these alerts are a fake and supposed to scare you into thinking your computer is in danger. You should ignore all of them!

As you can see, Windows Efficiency Manager is a totally scam that hides your desktop, displays false information and detects fake infections. The program created with one purpose to trick you into purchasing so-called “full” version of the program. Please use the removal guide below in order to remove Windows Efficiency Manager and any associated malware from your computer for free.

Use the following instructions to remove Windows Efficiency Manager

Step 1. Stop Windows Efficiency Manager from “autorunning”

Once Windows loaded you will see the Windows Efficiency Manager prompt. Click OK button. Once fake scan is complete, it will state you need to open the License Manager. Press the OK, Open the license manager button. Now you can close the program. Click “X” button at the top-right of WindowsEfficiencyManager or press ALT + F4. After that your Windows Desktop will be available.

Click Start, Type in search field (if you use Windows XP, then Click Start, Run and type in Open field):


Press Enter. It will open the contents of Application Data folder (for Windows XP) or the contents of Roaming folder (for Windows Vista, Windows 7) as shown in the screen below.

Contents of Application Data folder

Locate randomly named file (e.g. yewuyd.exe or yewuyd, look the example above), right click to it and select Rename. Type any new name (123.exe) and press Enter. Reboot your computer.

Step 2. Remove Windows Efficiency Manager associated malware

Download MalwareBytes Anti-malware (MBAM). Close all programs and Windows on your computer.

Double Click mbam-setup.exe to install the application. When the installation begins, keep following the prompts in order to continue with the installation process. Do not make any changes to default settings and when the program has finished installing, make sure a checkmark is placed next to Update Malwarebytes’ Anti-Malware and Launch Malwarebytes’ Anti-Malware, then click Finish.

If an update is found, it will download and install the latest version.

Once the program has loaded you will see window similar to the one below.

Malwarebytes Anti-Malware Window

Select Perform Quick Scan, then click Scan, it will start scanning your computer for Windows Efficiency Manager infection. This procedure can take some time, so please be patient.

When the scan is complete, click OK, then Show Results to view the results. You will see a list of infected items similar as shown below. Note: list of infected items may be different than what is shown in the image below.

Malwarebytes Anti-malware, list of infected items

Make sure all entries have a checkmark at their far left and click “Remove Selected” button to remove Windows Efficiency Manager. MalwareBytes Anti-malware will now remove all of associated WindowsEfficiencyManager files and registry keys and add them to the programs’ quarantine. When MalwareBytes Anti-malware has finished removing the infection, a log will open in Notepad and you may be prompted to Restart.

Windows Efficiency Manager removal notes

Note 1: if you can not download, install, run or update Malwarebytes Anti-malware, then follow the steps: Malwarebytes won`t install, run or update – How to fix it.

Note 2: if you need help with the instructions, then post your questions in our Spyware Removal forum.

Note 3: your current antispyware and antivirus software let the infection through ? Then you may want to consider purchasing the FULL version of MalwareBytes Anti-malware to protect your computer in the future.

Windows Efficiency Manager creates the following files and folders


Windows Efficiency Manager creates the following registry keys and values

HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Winlogon | Shell = “%AppData%\{random}.exe”

March 2, 2011 on 9:10 am | In Malware removal, Rogue Anti Spyware | 6 Comments |


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  1. Dude, thank you so very much, I was completely freaking out, you should’ve seen me a couple of minutes go, I was shaking in fear! But you’ve been completely helpful, clear with the instructions and a real relief for me, you really saved me and my computer, God bless you and your work as a computer magician :) you’re incredible, thank you.

    Comment by Diego Cabrera — March 2, 2011 #


    Comment by Nektarios — March 3, 2011 #

  3. Por dios eres lo maximo… You are the best…


    Comment by William — March 3, 2011 #

  4. Thank you!! This issue is still out there, saved me alot of headache.

    Comment by Ed — January 26, 2014 #

  5. Cured my Dell laptop perfectly. THANK YOU SO MUCH!!

    Comment by Justin — February 6, 2014 #

  6. terrific simple solution. Healed my dell laptop perfectly!!

    Comment by Justin — February 6, 2014 #

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