A. If during Installation you disabled ACPI to solve a problem (as seen in Q. How can I specify an alternate HAL during Windows 2000 installation?) you may want to enable again at a later time and this can be done as follows:

  1. Right click on 'My Computer' and select Properties from the context menu
  2. Select the Hardware tab
  3. Click the 'Device Manager' button
  4. Expand the Computer object
  5. Its type will be shown, probably 'Standard PC' (if it says (Advanced Configuration and Power Interface (ACPI) PC then ACPI is enabled already)
    Click here to view image
  6. Right click on the Computer type and select Properties
  7. Select the 'Driver' tab
  8. Click 'Update Driver'
  9. The Upgrade Device Driver Wizard will start. Click Next
  10. You can now either ask it to find a driver or manually select
  11. If you select Manual select the 'Show all hardware of this device class' and select the ACPI driver. Click Next
  12. Click Next to install the driver
  13. Click Finish to the wizard and click Close the computer property driver dialog
  14. Click Yes to restart your computer

Be careful with this though, if you select a HAL which your computer is not compatible with you may experience problems.