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The computer could not be shut down.
The reason why the computer can't be turned off and the solution;

The automatic program in the 1. system file is defective. Enter: rundll32user.exe, exitwindows to see if it can be shut down normally. If you can shut down normally under this command, there may be some defects in the automatic program. Check the integrity of system files and repair them.

File patching can be completed in the corresponding project. If patching files still doesn't solve the problem, you'll have to reinstall the system. When running Rundll32User. Exe and Exit Windows can't be shut down normally. It may be that some programs in the operating system are defective. The solution is to patch or reinstall the system.

2. Viruses and some defective programs or system tasks may cause shutdown failure. The first option is to kill virus and close all applications before shutting down. Because some programs are loaded when the system starts, you can delete all programs in the startup group, run msconfig programs into the startup group, and delete all programs to see if there are any programs that affect the shutdown.

3. The compatibility between peripherals and drivers is not good, and it is impossible to respond to quick shutdown. You can run msconfig, select Advanced in the General tab, and then select Disable Fast Shutdown in the window that opens. If you suspect that the peripherals are faulty, you can also remove the peripherals one by one and check them, so that you can find the influential peripherals.

4. If the sound file is set to be used when closing windows, the closing will fail if the file is damaged. Please select "Exit windows" in the sound event in the control panel.

5. When win98 shuts down automatically, it will display "It is safe to shut down now". This content is completed by the "logos.sys" file in the windows directory. If the file is damaged, it may also cause the computer to shut down. Solution, restore this file.

6.winxp cannot be automatically shut down after installation. If all the above reasons are eliminated, it may be that the power options in the control panel are set incorrectly. Please check your settings to ensure that ACPI and APM can work properly.

There is also incompatibility between APM and winxp in the bios of some motherboard systems, because it cannot be shut down automatically. Choosing to shut down becomes restarting the system. In this case, you can only turn it off manually. The solution is to upgrade the system bios of the motherboard and adopt a new version.