Whilst looking through `All Programmes` in `Accessories` I clicked on the above item and found many tasks in `System Tools` and `Scheduled Tasks` stating `Could not start`. Why should this be?
I'd take a guess that they are scheduled updates for software that you no longer have installed, but if you post the names of some of the tasks that couldn't start it will be possible to answer properly.
There is a good chance you'll be able to delete most of them.