Checkpoint Task Scheduler is not running on Windows XP?

This one stumped me, but a bit of digging on the net revealed a straightforward solution, courtesy of Microsoft MVP Wes Vogel:

Whatever tasks that were scheduled to run expected to see your old account - Jim H. - as an administrator.

Open the SchedLgU.txt and see what you can see. You can do that by starting up the text editor on that particular file:

Start --> Run --> then type in SchedLgU.txt and click OK.

Or, if you'd prefer a different - text only! - editor, open up C:\WINDOWS\SchedLgU.txt

Or, if you'd prefer to use a more structured application, open Scheduled Tasks then, on the Advanced menu, click "View Log".

I'd recommend that your first step be to try deleting all Scheduled Tasks, which can be done thusly:

1. Click Start, point to Settings, and then click Control Panel.
2. Click the view all Control Panels link if you can not see the Scheduled Tasks Control Panel.
3. Double-click the Scheduled Tasks Control Panel to open it.
4. Click the task that is being missed.
5. On the File menu, click Delete.
6. Click Yes to delete the task.

There are also two Microsoft support articles worth reading:

• Task Scheduler Notifies of Missed Task on Every Startup
• How to prevent a user from running Task Scheduler in Windows

Hope that gets you up and running again with your Windows PC.