The selected task 0 no longer exists

[VSW]

Ok...if you mean you can't find the guid Id string,
That's it highlighted in blue...notice the corresponding numbers in the string...8632442E - etc
But yer messing with the registry, Be Very Careful,
Make sure you have a backup ready and it's easy to implement in case of a mistake.

The Adobe Acrobat Update Task is just an example right, that's not the one I'm suppose to look for?

The error I get it from WPD, that's when the error 0 pops up.
Yea I can find the string for the error I'm getting in this subkey: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Schedule\TaskCache\Tree

But the following subkeys I cannot it anywhere them.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Schedule\TaskCache\Boot
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Schedule\TaskCache\Logon
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Schedule\TaskCache\Maintenance
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Schedule\TaskCache\Plain
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Schedule\TaskCache\Tasks