What is sihost.exe?

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the sihost.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

Click to Run a Free Scan for sihost.exe related errors

Sihost.exe file information

The process known as Shell Infrastructure Host belongs to software Microsoft Windows Operating System or MSXML by Microsoft ( or InfoSecSolution.

Description: Sihost.exe is not essential for the Windows OS and causes relatively few problems. Sihost.exe is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 309,040 bytes (50% of all occurrences), 316,968 bytes or 315,432 bytes. 
The software can be uninstalled in the Control Panel. The program has no file description. The program has no visible window. The sihost.exe file is digitally signed. It is not a Windows core file. It can change the behavior of other programs or manipulate other programs. The application is a hidden stealth process. Sihost.exe is able to monitor applications and manipulate other programs. Therefore the technical security rating is 87% dangerous, however you should also read the user reviews.

Uninstalling this variant: If problems with MSXML come up, you can remove the entire program using Windows Control Panel or ask the software vendor,, for advice.

Recommended: Identify sihost.exe related errors

If sihost.exe is located in the C:\Windows\System32 folder, the security rating is 2% dangerous. The file size is 58,368 bytes (50% of all occurrences) or 43,520 bytes. The sihost.exe file is a Windows core system file. The sihost.exe file is a Microsoft signed file. The program is not visible.

Important: Some malware camouflages itself as sihost.exe. Therefore, you should check the sihost.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

If you stop the process sihost.exe from running you get the error banner ((Critical Error – Start menu and Cortana aren’t working. We’ll try to fix it the next time you sign in.)) This is an error that Microsoft has no solution for yet.

Summary: Average user rating of sihost.exe: based on 1 vote with 1 user comment. One user thinks sihost.exe is essential for Windows or an installed application.

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

Best practices for resolving sihost issues

A clean and tidy computer is the key requirement for avoiding problems with sihost. 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.

To help you analyze the sihost.exe process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

sihost.exe [all]