Solved Fixing Windows Calendar scheduled task after computer name change

Since it took me awhile to solve this problem, I figured I would document it here for others.

Problem:

If you change the name of your computer (under Control Panel\System and Maintenance\System), then the scheduled task that Windows Calendar has will NOT be updated with the new name of the computer. The result is that this scheduled task does not run properly when it is supposed to, and when you open up the Task Scheduler, you get an error popping up in Task Scheduler:

"An error has ocurred for the task Reminders - {User Name}. Error message: The specified account name is not valid."

Where {User Name} is your user name.


Solution:

1) Make sure that Windows Calendar is not running.

2) First delete the task in Task Scheduler. In Task Scheduler, go to:
Task Scheduler : Task Scheduler Library : Microsoft : Windows : WindowsCalendar
and delete the task there called "Reminders - {User Name}"

3) Now delete the XML files for that task. In Windows Explorer, go to:
C:\Windows\System32\Tasks\Microsoft\Windows\WindowsCalendar
and delete the file there called "Reminders - {User Name}"

4) Now we need to delete the Windows Registry entries for the task. Using Registry Editor:

4a) Go to: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Schedule\TaskCache\Tree\Microsoft\Windows\WindowsCalendar\Reminders - {User Name}
In that key will be an entry called "Id" of type REG_SZ. Take note of the data of that entry (something like {EE926D4D-D775-42A6-A71D-1F53D605F770}). Then delete that key "Reminders - {User Name}"

4b) Go to: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Schedule\TaskCache\Logon
and delete the key with the name that is the Id noted in step 4a).

4c) Go to: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Schedule\TaskCache\Tasks
and delete the key with the name that is the Id noted in step 4a).

5) Close Registry Editor, and reboot computer.

6) Run Windows Calendar.

thank you.
none of the reg files were present but I did delete the task.

The solution worked as stated!!!

For the record, I never got an error message from running Calendar;
it simply wouldn't run after being closed/exited,
even though I had the
"Reminders should show ... when not running" option selected.

There was no "Reminders - user name" data key as described in 4a,
but, I did everything that I could, as written.
Then, after rebooting, Calendar ran automatically (it's in my "Startup"),
so I created a test appointment to trigger a half-hour after the current time,
and set the reminder for 5 minutes, then closed (i.e., exited) Calendar.
After waiting a few anxious minutes, lo-and-behold, it appeared!

Thanks VERY much WinRider6!!! :D