The subject problem may be caused by the active bus polling that is required to maintain communications with USB devices, even if you don't have any USB devices connected.

Windows 2000 polls every 1 millisecond, which may be preventing the processor from entering the C3 processor power-saving state.

To resolve this issue:

1. Use the Registry Editor to navigate to:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Class\\{36FC9E60-C465-11CF-8056-444553540000\}.

2. Look in each sub-key (0000, 0001, 0002, etc) for the IdelEnable Value Name, a REG_DWORD data type. If the Value Name is missing, add it.

3. Set the data value of  IdelEnable to 1, if you just added it.

4. Repeat steps 2 and 3 for each sub-key.

5. Shutdown and restart your computer.

If the problem is not solved:

1. Use the Registry Editor to navigate to:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Class\\{36FC9E60-C465-11CF-8056-444553540000\}.

2. Look in each sub-key (0000, 0001, 0002, etc) for the IdelEnable Value Name and add 1 to the current data value.

3. Repeat step 2 for each sub-key.

4. Shutdown and restart your computer.

If the problem is not solved, repeat steps 1 - 4.

NOTE: If your computer uses Advanced Power Management (APM) or Advanced Configuration and Power Interface (ACPI), it may experience increased power consumption.