Solve WindowsXP can not shut down properly

friends' computer configuration is: K6-2 266MHz @300MHz, MVP3 (AT board type) motherboard, 160 MB SDRAM (PC100), FUJITSU 10G hard drive, CMI-8330 ISA interface sound card, graphics card is SIS6326, AT power supply.
In the past, after the shutdown operation was performed, it was not displayed that “it can be safely shut down now” (if it is ATX motherboard plus ATX power supply, of course, it is automatically shut down), but it is restarted, and can only be manually forced to shut down. In fact, the shutdown is not normal in Windows 98SE is a very common situation. Common reasons are: 1. The operating system and motherboard support for ACPI or APM is not perfect. 2. Various hardware outside the motherboard is not perfect for ACPI or APM support. 3. The bug of the hardware driver. 4. The motherboard's BiOS needs improvement. 5. The system is not good enough for fast shutdown support (only for Windows 98). 6 There are some resident memory programs that exit before shutting down and conflict with the system shutdown process. 7 virus. 8 Disk subsystem failures, such as IDE driver and system compatibility is not good enough. Of course, there are many other reasons, and I can't repeat them here. Because the friend is a newly installed operating system, in addition to the sound card driver (other hardware is driven by the operating system), various applications have not been installed. Therefore, the author focused on the problem of insufficient support for power management in the motherboard and operating system. Adhering to the principle of easy and difficult, first enter the CMOS settings interface of the motherboard, in the power management, PM control by APM is turned off, after booting into the system, then shut down, the computer still restarts. Then start WindowsXP, go to Control Panel\\Power Management, click the “Hibernate” menu, then enable hibernation is unchecked, and tick “Enable Hibernate”, but it still fails. Re-enter the power options in the control panel, click on the "Advanced Power Management" sub-page, the system shows: the machine supports Advanced Power Management (APM), using APM can reduce the system's power loss. At this time, "Enable Advanced Power Management Support" is selected. Without hesitation, I will remove the "Enable Advanced Power Management Support". It will cost more power, and it will not shut down properly. The next step is of course shutdown, OK, "There can be safe shutdown now" a few words came out, haha, quite kind. This example is due to the system's lack of advanced power management support, or can be eliminated by upgrading the BIOS, but this motherboard is old, may not be able to find updated BiOS, so did not try, on the ATX motherboard, It is recommended to still enable advanced power management, otherwise there may be trouble.