Hi facebreeze 你好,
请问你重启过你的 Task Scheduler 服务吗？是重启之后也没有用吗？
a. 点击开始菜单.
b. 搜索框中输入对应的service.
c. 右击Services,Run as Administrator
d. 右击Task Scheduler Service 选择重新启动.
另外你可以查一下注册表，所有task的值都在以下注册表，你可以看一下是否都在。
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Schedule\TaskCache\Tasks
尝试去恢复那些注册表。
https://social.technet.microsoft.com/Forums/en-US/29c24b83-6793-4792-8b40-7d3dcbe41461/backup-and-restore-the-registry-in-windows-server-2008-r2?forum=windowsbackup
这是windows 7 关于恢复任务计划程序的过程，建议你可以参考一下。如果需要更改你windows server 2008 R2的注册表，请提前做好备份。
http://answers.microsoft.com/en-us/windows/forum/windows_7-performance/task-scheduler-error-the-selected-task-0-no-longer/04477cf7-af29-4967-b9ac-1936b1179f7f?db=5&auth=1
Best Regards,
Mary Dong
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