What is mscoree.dll?
The genuine mscoree.dll file is a software component of Microsoft .NET Framework by Microsoft Corporation.
"MSCorEE.dll" is a Microsoft library file which is essential for the execution of "managed code" applications written for use with the .NET Framework. It resides in "C:\Windows\System32". Only one instance runs at a time. It is called when execution begins of a managed code Portable Executable (PE) file, which has a ".exe" suffix like a machine-language file but is different internally. "MSCorEE.dll" consults the manifest that is always associated with a .NET assembly. (An assembly can have one or more files, one of which always is or includes the manifest). "MSCorEE.dll" determines which version of the .NET Framework's Common Language Runtime (CLR) to call; the CLR then compiles the Common Intermediate Language (CIL) in the assembly into executable machine code. The CLR also provides all assemblies with standard infrastructure like disk I/O, memory management and garbage collection.
MsCoREE stands for Microsoft .NET Common Language Runtime Execution Engine
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.
Mscoree.dll file information
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 (57% of all occurrences), 282,112 bytes and 13 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 84 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 53% 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:
- This legitimate BHO (mscoree.dll) is related to ACT! 2005
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 ▾- In Internet Explorer, press the key combination Alt + X to open the Tools menu.
- Click Internet options.
- Click the Advanced tab.
- Click the Reset... button.
- Enable the Delete personal settings option.
Best practices for resolving mscoree issues
The following programs have also been shown useful for a deeper analysis: ASecurity Task Manager examines the active mscoree process on your computer and clearly tells you what it is doing. Malwarebytes' well-known Banti-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 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic 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 6resmon 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 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.
Other processes
sfc_os.dll jhi_service.exe clistart.exe mscoree.dll suptab.dll dirmngr.exe opera.exe aswhookx.dll npwinext.dll browserconnection.dll agent.exe [all]
Score
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Summary: Average user rating of mscoree.dll: based on 24 votes with 18 user comments. 14 users think mscoree.dll is essential for Windows or an installed application. 6 users think it's neither essential nor dangerous. 4 users think mscoree.dll is dangerous and recommend removing it. 4 users don't grade mscoree.dll ("not sure about it").