I can't say for Pandora's but system and CCleaner language are the same (Russian). BTW only one secured run let me free the space on drive D. My usual DOD 3 run method didn't work for me just like normal file deletion.
I have the same problem. It's not the first time when this problem appears. For example I have 9 megabytes free on drive D. I try to delete 4.5 GB of information from this drive. And what do I have now? 328 KBs! WTF?