Other than what Wildabeast
suggested, here's a few more options to try.
Have you checked the folder's Properties?
Right click the folder, and select Properties
Make sure it's not
set to, Read-only
If it is, uncheck it, click Apply
, and click OK
Now try to delete it.
Have you tried renaming the file, then deleting it?
Name it anything you want, like trash, old, useless, ........ whatever.
If none of the above works, here are a couple of programs, you can try:UnlockerEraserDelete Doctor
There's also this Microsoft Knowledge Base Article that might be helpful:How To Take Ownership of a File or Folder in Windows XP