PM calls for promotion of national single window systemThe Saigon Times Daily Prime Minister Nguyen Xuan Phuc speaks at the national conference on. When users sign out, the task host window frequently comes up and termination of applications that block or cancel shutdown" disabled; GPO. Task Host is a windows program, not a virus or malware. When you shut down your system, Task Host ensues that programs previously running were closed properly to avoid data and program corruption. Technically, it is recommended to close all running programs before you initiate. I am experiencing the TaskHost message preventing shut down in Win I found these instructions in this community dated so not. Edit WaitToKillServiceTimeout via Registry Editor WaitToKillServiceTimeout determines how long the system waits for services to stop after.