Hi Jerry,
Thank you for posting in Microsoft community.
This issue might occur if any third party program is accessing the file.In regards to the issue, I require additional information to make sure that helps us to resolve the issue easily:
- How are you trying to delete these files?
As a first step, I suggest you to restart the computer multiple times and check if that works. Because, restarting computer will close the applications that are running in the background and fixes many issues.
I also suggest you to refer the suggestion provided by Tomfly13 on April 29, 2013 and check if it helps.
Please reply us on the status of the issue to assist you further
Thanks.