acess denied to delete file

I have program that create file 'log' but when I tried to delete this file I cant there is acess denied message
that file ('log') isn't in any directory

This tends to be more of a "file is already in use" error rather than a "permissions" error - you may've forgotten to close your file handle, perhaps (difficult to comment without seeing your code).

Try rebooting the computer and giving deletion another go.