While using bitdefender 2014 internet security or free, If you install VLC player or update it and then run ccleaner, ccleaner will crash while trying to erase the c:\users\*username*\appdata\local\temp\vlc-2.1.3-win32.exe file. It basically locks up the system, preventing reboot or shutdown on 5 different PC's here running win 7 64 bit with either bitdefender IS 2014 or bitdefender free. Rebooting into safe mode and manually deleting the item solves the problem until vlc is updated again. I have run into a couple other files that lock up BD in the same subdirectory but didn't write them down, I will in the future and post them here on the forum.