The below article is still offered for those of you who have not upgraded, but with IE 5.01 SP1 this problem has been corrected. Read this tip for a bigger and better solution than AT.EXE!

For those of you that rely on the scheduler server to perform deployments, you likely script those commands with the AT.EXE or SOON.EXE command line tools. With IE 4 and later you may find that you get inconsistent or unexpected results.

The problem is the Task Scheduler replaces the Scheduler service and does not provide the same support at the command line. It doesn't appear to be something on the drawing board to be fixed either- this is another "functions as designed" item. Events are to be scheduled using the GUI for the Task Scheduler.

So take it off! Check out Q196731 for details on how to remove the Task Scheduler and get you beloved Scheduler Service back again:

Key Name:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Schedule
Value Names:
DependOnGroup: REG_MULTI_SZ
DependOnService: REG_MULTI_SZ: RpcSs
DisplayName: REG_SZ: Task Scheduler
ErrorControl: REG_DWORD: 0x1
Group: REG_SZ:
ImagePath: REG_EXPAND_SZ: C:\WINNT\System32\MSTask.exe
ObjectName: REG_SZ: LocalSystem
Start: REG_DWORD: 0x3
Type: REG_DWORD: 0x120 

Key Name:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Schedule
Value Names:
ErrorControl:REG_DWORD: 0x1
ImagePath: REG_EXPAND_SZ: %SystemRoot%\System32\AtSvc.Exe
ObjectName: REG_SZ: LocalSystem
Start: REG_DWORD: 0x2
Type: REG_DWORD: 0x10