Mscoree.dll is a browser extension for Internet Explorer. This add-on enables several additional functions for Internet Explorer. You can disable it through the Extras menu (key combination Alt + X) under Manage Add-ons. You can fix your mscoree.dll problem by downloading the correct mscoree.dll file. The following paragraph provides more information about Microsoft .NET Runtime Execution Engine.
The process known as Microsoft .NET Runtime Execution Engine belongs to software Microsoft .NET Framework (version 4 Client Profile, 4 Client, 4) or Microsoft Windows Operating System by Microsoft (www.microsoft.com).
Description: Mscoree.dll is not essential for the Windows OS and causes relatively few problems. The mscoree.dll file is located in the C:\Windows\System32 folder.
Known file sizes on Windows 10/8/7/XP are 297,808 bytes (58% of all occurrences), 282,112 bytes and 9 more variants.
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 D5233FCD-D258-4903-89B8-FB1568E7413D or 5b0a01d2-b8a0-4e56-9e6b-cba0ef4b4eb5 or 82 more variants. The program has no visible window. The file is not a Windows system file. There is no detailed description of this service. The file is able to change the behavior of, or monitor Internet Explorer. It is certified by a trustworthy company. Therefore the technical security rating is 54% dangerous, however you should also read the user reviews.
Recommended: Identify mscoree.dll related errors
If mscoree.dll is located in a subfolder of "C:\Program Files", the security rating is 32% dangerous. The file size is 276,248 bytes. The program can be uninstalled in the Control Panel. The program has no visible window. The mscoree.dll file is a Verisign signed file. It is able to monitor web browsers. The mscoree.dll file is certified by a trustworthy company. The service has no detailed description. It is not a Windows system file.
External information from Tony Klein:
Important: Some malware disguises itself as mscoree.dll, particularly when not located in the C:\Windows\System32 folder. Therefore, you should check the mscoree.dll process on your PC to see if it is a threat. If Microsoft .NET Runtime Execution Engine 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 ▾
The following programs have also been shown useful for a deeper analysis: Security Task Manager examines the active mscoree process on your computer and clearly tells you what it is doing. Malwarebytes' well-known anti-malware tool tells you if the mscoree.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.