It's obviously Power-DVD? It's a Program Folder, you can't delete it while the program is running, and you may have it running automatically at start?
Why you need to get rid of it, I don't know, but you can't do it that easily in Windows 7 - it's actually for your own protection, in order to prevent accidental deletes.
But, uninstall the program PowerDVD, I recommend using Revo,
Download Revo Uninstaller Freeware - Free and Full Download - Uninstall software, remove programs, solve uninstall problems. Use default settings. That way you'll get rid of it.
You can't really get rid of a folder unless getting rid of the program. Doing so by force may be dangerous.