Hello lingyai

Definitely I'm trying to be constructive. Somehow I doubt that BiaB uninstalled itself, although the results might appear that way. I suspect some sort of drive error, and maybe something performed a rollback to an earlier time. But I doubt any BiaB program error caused the entire program to uninstall itself. I really think this needs to be explored outside of the BiaB program. Andrew's suggestion to run ChkDsk is a good place to start.

BIAB & RB2024 Win.(Audiophile), Sonar Platinum, Cakewalk by Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Kontakt, Focusrite 18i20, KetronSD2, NS40M Monitors, Pioneer Active Monitors, AKG K271 Studio H'phones