New
#11
Try taking ownership of the full directory tree for that user. Even if you have already done this, Id suggest doing it again.
When you click on change and change the owner, you type in the name for your account and click OK (or add, Im not sure right off hand). When you come back to the advanced permissions screen, you should have a check box saying something to the effect of "Also apply changes to all containers and objects within these containers."
Click apply and let it change owner on everything within that tree. Then you go back to the folders you were trying to delete. You may have to go back in and add seperate permissions for yourself and disable inheritance.