How to remove the msjsun virus

Most antivirus programs identify msjsun.dll as malware—for instance TrendMicro identifies it as PE_Generic, and Kaspersky identifies it as

The free file information forum can help you find out how to remove it. If you have additional information about this file, please leave a comment or a suggestion for other users.

Click to Run a Free Virus Scan for the msjsun.dll malware

Msjsun.dll file information

The process known as CompressedExt Module belongs to software CompressedExt Module by unknown.

Description: Msjsun.dll is not essential for Windows and will often cause problems. Msjsun.dll is located in the C:\Windows\System32 folder. The file size on Windows 10/8/7/XP is 57,344 bytes. 
This is a special .dll file (Dynamic Link Library), which starts automatically when programs are launched. So it can monitor or manipulate all of your program starts. The software has no file description. The program is not visible. The file is not a Windows system file. The msjsun.dll file is an unknown file in the Windows folder. It monitors program starts. msjsun.dll appears to be a compressed file. Therefore the technical security rating is 65% dangerous.

Recommended: Identify msjsun.dll related errors

Important: You should check the msjsun.dll process on your PC to see if it is a threat. If CompressedExt Module 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.


User Comments

There are no user opinions yet. Why not be the first to write a short comment?

Do you have additional information? Help other users!
What do you know about msjsun.dll:
How would you rate it:
Link for more info:
Your Name:

Best practices for resolving msjsun issues

The following programs have also been shown useful for a deeper analysis: Security Task Manager examines the active msjsun process on your computer and clearly tells you what it is doing. Malwarebytes' well-known anti-malware tool tells you if the msjsun.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

msjsun.dll [all]