Seems like he is trying to delete the windows old folder. That is a tough folder to delete, as advised, you need to take ownership of the folder from the root so that it can propagate to the sub folders. Download and merge this reg key: http://files.getdropbox.com/u/976813...20registry.reg
then right click on the main folder, the choose take ownership, and wait for the settings to finish, then try deleting the folder. I am working on a reg script that will allow you set a folder for delete on reboot. I will try to have it finished today.
Edit: the power of google is always respected, lol. There is a tool already created: http://www.cfishelltoys.com/download.asp
you can use it with full functionality for 45 days. Hopefully it won't take you 45 days to delete your folder, lol.