What is trustedinstaller.exe?
What is this exe file?
Trustedinstaller is a built-in user account in both Windows 7 and 8, and Windows Vista. In fact, it is said that this user account, or process, “owns” a range of system files, which includes certain files in the Program Files folder, the Windows folder. Also, it includes the Windows.old folder which is created after the upgrading of one version of Windows to another. So, the best way to describe this process is thus: in order to rename or even delete the files, you have to take ownership of them from TrustedInstaller (a process of a Windows Modules Installer service which is included with Windows). Thereby, this service has the task of installment, modification and removal of Windows updates, as well as other optional Windows components. Also, it has the special ability of modifying them.
What is its main function?
Its primary purpose is enabling the installing, removal and modifying of Windows Updates as well as some optional system components.
Where is it located?
It is located at C:\Windows\servicing. The normal startup of this service is in the Manual section, running in the Local System Account.
What happens if this file is corrupt?
Then you will get a message to that effect, and in this case you can run the System File Checker. However, if the Windows Resource Protection service is affected (and this is the program which runs the system file checker), and you make an attempt to run sfc/scannow, it is highly likely that you will get the usual message informing you that you have an error.
What happens if Windows Resource Protection cannot start the repair service?
If this should happen, it may be that you will have to fix Windows 7 or refresh Windows 8.
What happens if trustedInstaller.exe is using an excess proportion of resources?
There are times, particularly after downloading and installing Windows Updates, when you may find that TrustedInstaller.exe (in the Task Manager) is using far too many resources. This, however, is routine, and it should be allowed to run its course.
Can TrustedInstaller.exe be disabled?
While there are many methods of disabling or even removing TrustedInstaller.exe (and a number of sites suggest this), this should not be done, due to the fact that it is a protected resource within the system. In fact, if you do disable the service, it is quite likely that Windows Updates might be unsuccessful in installing or even be completely uninstalled.
Can it be deleted?
If, after upgrading to a newer Windows version, you are making an attempt to delete the Windows.old folder, and you see a message which says that you need to obtain permission from TrustedInstaller, it is a fact that you do not require to take ownership of the files whatsoever. All you need to do is use the Disk Cleanup wizard. In order to open Disk Cleanup wizard, hit the Windows key, type in Disk Cleanup. Then, in Windows 7, you need to click the Disk Cleanup shortcut which pops up in the Start menu. However, in Windows 8, you need to click the Settings category and choose the shortcut of Free up disk space by deleting unnecessary files”.