How to remove the Windows Explorer cdrom optimizer malware

Most antivirus programs classify egmulhxk.dll as a harmful extension to Internet Explorer: such as Trojan Horse or Downloader.MisleadApp (detected by Symantec), and TROJ_DLOADER.HE or TROJ_DLOADER.SUY (detected by TrendMicro). Add-ons like this can display ads, slow down your computer and cause various other errors. If you can't remember installing the associated Windows Explorer cdrom optimizer software, it's no surprise. In most cases, this kind of adware is installed on the side when you install a freeware product like a Youtube Downloader or a PDF Converter. In the following selection, you can read more about Windows Explorer cdrom optimizer and how to get rid of it.

Click here to automatically remove the Windows Explorer cdrom optimizer malware

Egmulhxk.dll file information

The process known as Windows Explorer cdrom optimizer appears to belong to software Windows Explorer cdrom optimizer by Microsoft (

Description: Egmulhxk.dll is not essential for Windows and will often cause problems. The file egmulhxk.dll is located in the C:\Windows\System32 folder. The file size on Windows 10/8/7/XP is 21,504 bytes. 
This .dll file is a Browser Helper Object (BHO) that runs automatically every time you start your web browser. BHOs are not stopped by personal firewalls, because they are identified by the firewall as part of the browser itself. BHOs are often used by adware and spyware. IDs used by this BHO include E78B911A-6F68-4B84-8C19-EC417C9590E2 or 477840F3-BA52-44D9-8E41-38D61CAA010F. The program is not visible. The egmulhxk.dll file is located in the Windows folder, but it is not a Windows core file. It is able to monitor web browsers. There is no detailed description of this service. The file is not a Windows core file. egmulhxk.dll appears to be a compressed file. Therefore the technical security rating is 72% dangerous.

Recommended: Identify egmulhxk.dll related errors

Important: You should check the egmulhxk.dll process on your PC to see if it is a threat. If Windows Explorer cdrom optimizer has changed your browser's search engine and start page, you can recover your browser's default settings as follows:

Reset default browser settings for Internet-Explorer ▾
  1. In Internet Explorer, press the key combination Alt + X to open the Tools menu.
  2. Click Internet options.
  3. Click the Advanced tab.
  4. Click the Reset... button.
  5. Enable the Delete personal settings option.
This will reset your Internet Explorer to its default settings. Your browser will start with the familiar start page and search engine—without popups, ads, cookies, but all browser add-ons are deleted too [1]. Make cleaning up your browser and your computer simpler and safer with Security Task Manager.


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Best practices for resolving egmulhxk issues

The following programs have also been shown useful for a deeper analysis: Security Task Manager examines the active egmulhxk process on your computer and clearly tells you what it is doing. Malwarebytes' well-known anti-malware tool tells you if the egmulhxk.dll on your computer displays annoying ads, slowing it down. This type of unwanted adware program is not considered by some antivirus software to be a virus and is therefore not marked for cleanup.

A clean and tidy computer is the key requirement for avoiding PC trouble. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

Other processes

egmulhxk.dll [all]