User Account Control Failure

> While attempting to delete a file I was told that I needed permission to
> do
> this and asked if I wished to retry. The retry does not work even
> though I am
> logged in as administrator. I opened up the permissions on the file and
> folder with no joy. I disabled user account control and was able to
> delete
> the file so I re-enabled user account control. Now I have the problem
> again
> on another file but disabling user account control does not enable the
> deletion.
> Can anyone shed some light on why, when logged in as administrator and
> the
> file permissions are wide open AND user account control is disabled I
> should
> get a message that I need permission to do it and the retries still
> fail?