Scenario 1:
If you have installed a current Wavelab update, but didn't apply the ASPI driver update, download the ASPI driver and run it.

Scenario 2:
If you installed an update AND installed the ASPI fix, then go into add/remove programs on your computer, and remove ASAPI or ATAPI from your programs list. Once its removed, reinstall the Wavelab update WITHOUT installing the ASPI driver.

Scenario 3:
If you haven't updated Wavelab at all and this just kind of creeped up out-of-the-blue, the easiest thing to do would be to try the update and see if it fixes it. If the update doesn't fix it, install the ASPI driver and see if that works. If none of those options work, remove ASAPI or ATAPI from add/remove programs, then uninstall and reinstall Wavelab from your disc.

You can reference the link below to get the drivers and the ASPI fix.