diagER.dll is the Diagnostic ER Module of the OOBE (out of box experience) modules in Windows.
Non-system processes like diager.dll originate from software you installed on your system. Since most applications store data on your hard disk and in your system's registry, it is likely that your computer has suffered fragmentation and accumulated invalid entries which can affect your PC's performance.
In Windows Task Manager, you can see what CPU, memory, disk and network utilization is causing the Windows process. To access the Task Manager, hold down the Ctrl Shift Esc keys at the same time. These three buttons are located on the far left of your keyboard.
The diager.dll is an executable file on your computer's hard drive. This file contains machine code. If you start the software Windows on your PC, the commands contained in diager.dll will be executed on your PC. For this purpose, the file is loaded into the main memory (RAM) and runs there as a Windows process (also called a task).
This process is considered safe. It is unlikely to pose any harm to your system.
diager.dll is a safe process
Many non-system processes that are running can be stopped because they are not involved in running your operating system.
diager.dll is used by 'Windows'. This is an application created by 'Microsoft Corporation'.
If you no longer use Windows, you can permanently remove this software and thus diager.dll from your PC. To do this, press the Windows key R at the same time and then type 'appwiz.cpl'. Then find Windows in the list of installed programs and uninstall this application.
This process is not considered CPU intensive. However, running too many processes on your system may affect your PC’s performance. To reduce system overload, you can use the Microsoft System Configuration Utility (MSConfig) or the Windows Task Manager to manually find and disable processes that launch upon start-up.
Use the Windows Resource Monitor to find out which processes and applications write/read the most on the hard drive, send the most data to the Internet, or use the most memory. To access the Resource Monitor, press the key combination Windows key R and then enter 'resmon'.
Most diager issues are caused by the application executing the process. The surest way to fix these errors is to update or uninstall this application. Therefore, please search the Microsoft Corporation website for the latest Windows update.
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