This will change Windows 2000's HAL to use the PMTimer instead of the ACPI timer. It might drop the CPU by a bit, but nowhere near as far as the other apps will. Using the PMTimer will lessen the load on a machine with an ACPI timer issue, but this is more relevant on AMD chips than Intel chips, and will do little on Intel chips (this makes a huge difference on AMD processors). I suppose you're right. I only applied this fix a long time ago on an old computer with VIA K8T800Pro and an Athlon 4000+ which worked fine.