first you have to be an Admin then what you have to do is open My Computer then click on Tools and you’ll find Folder Options. when you find this click on it and you will see 4 tabs, you will choose View. now scroll down all the options and all the way at the bottom you will see “use simple file sharing (recommended)” uncheck that. hit apply and exit folder options. find the file you want to delete then rigth click it and hit Properties click the Security tab and click on the button that reads “add” and enter you login name and click OK now you should be able to delete the file.