What is mssys.dll file ?

Most antivirus programs identify mssys.dll as malware—e.g. Symantec identifies it as Backdoor.Trojan, and Kaspersky identifies it as Trojan.Win32.Zapchast.aews.

Follow steps bellow to try fix the problem with mssys.dll

1. Use cleanmgr

To run the command cleanmgr :
Press Windows key + Q.
Enter cmd in search box , followed by the combination Ctrl + Shift + Enter to run it as Administrator.
Enter the command cleanmgr and press Enter.

2. Use sfc /scannow

To run the command sfc /scannow :
Press Windows key + Q.
Enter cmd in search box, followed by the combination Ctrl + Shift + Enter to run it as Administrator.
Enter the command sfc /scannow and press Enter.

3. uninstalling programs :

To uninstall unnecessary programs :
Open the Start menu (Press Windows key + X) .
Click the first menu item Programs and Features.
Search unnecessary programs in the list of installed programs, .
Click the software you want to uninstall.

4. using msconfig

To run the command msconfig :
Press Windows key + Q.
Enter cmd in search box, followed by the combination Ctrl + Shift + Enter to run it as Administrator.
Enter the command msconfig and press Enter.

5. Automatic Update

To run the command wuauclt /ShowWindowsUpdate:
Press Windows key + Q.
Enter cmd in search box, followed by the combination Ctrl + Shift + Enter to run it as Administrator.
Enter the command wuauclt /ShowWindowsUpdate and press Enter.

6. Use resmon command

To run the command resmon :
Press Windows key + Q.
Enter cmd in search box, followed by the combination Ctrl + Shift + Enter to run it as Administrator.
Enter the command resmon and press Enter.

7. use DISM.exe

To run the command DISM.exe /Online /Cleanup-image /Restorehealth :
Press Windows key + Q.
Enter cmd in search box, followed by the combination Ctrl + Shift + Enter to run it as Administrator.
Enter the command DISM.exe /Online /Cleanup-image /Restorehealth and press Enter.

mssys.dll descriptions

Mssys.dll is not essential for Windows and will often cause problems. Mssys.dll is located in the C:Windows folder.;The file size on Windows 10/8/7/XP is 67,072 bytes.;A.dll file (Dynamic Link Library) is a special type of Windows program containing functions that other programs can call. This.dll file can be injected to all running processes and can change or manipulate their behavior.;There is no description of the program. It can change the behavior of other programs or manipulate other programs. The program has no visible window. The service has no detailed description. The program starts when Windows starts (see Registry key: AppInit_DLLs).;The mssys.dll file is not a Windows system file.;mssys.dll appears to be a compressed file.;Therefore the technical security rating is 94% dangerous, but you should also take into account the user reviews.