> Hi. I have a original disk of windows vista business upgrade. Two weeks ago I
> intalled over a windows xp. No problem at all.
> Yesterday I hard disk died. Today I intall the same original windows xp and
> I try to upgrade to windows vista, but a error appears tells me that Vista
> must be installed on c omputer that supports ACPI.
> Well, Vista was right, on by BIOS setup I had ACPI disable. My mistake. But
> I already Enable it. I tried aain to upgrade to Vista but the same message
> Do I must install XP with ACPI enable and only then upgrade to Vista???
> Do I need to format the computer again?
Sometimes you can change the HAL to accomodate the resetting of ACPI. There
are some KBs on this. However, you are better off doing a repair install of
XP at best.