access denied after moving files

If I move a file, so far this has happened for gps- and
music files, after moving them from one folder to
another, I cannot alter (ie view, edit listen etc.), move
or delete the file. It says acces denied, that they are write protected or
another program is using it. The latter is impossible. I am using the
administrator account in windows xp.

There's no security tab popping up after right-mouse click, so taking
ownership will not help. I think something has gone corrupted during moving
the files.

Thanks,