When your computer boots from CD in order to install Windows, hit F5. Wait, a menu will appear, select ACPI. Of course, you must enable ACPI in Power Management Setup.
my pc does shut down but manually must be turned off by the AVR im using win xp SP2 it does shut down but it only shows the message "its now safe to turn off your computer" i was using win 98 before and it shuts down automatically after it says the message "its now safe to turn off your computer"
heres the specs
Bios date 01/15/99
Bios type award modular bios v4.51pg
OEM sign on: V.791BS_2 A06
Bios ID 01/15/99-691-586B-W877-2A6LFJ1CC
Chipset : VIA 82C691 rev1
CPU: Intel celeron MMX 300aMhz
Ram :129
Board by Jetway J-791BS
In Windows 2000, and probably also XP, you can install with APM support by pressing (I think) F7 when setup starts.
If the problem is simply that you cannot install because you do not have ACPI support, you may be able to do something similar to install with APM support.