Hello,
Please I need help fast. I was using BitDefender 2011, but decided to upgrade to BitDefender 2012. I downloaded the installer, and I ran it. It detected the previous version of BitDefender and told me to uninstall it first. I did that and restarted my PC. After restart, the new setup started, the license key and my email were already filled in, so I clicked next to begin the installation. But then it starts the first step "Scan system files for viruses" and it stays on 0% forever, the little circle is rotating but nothing happens.
Please how can I solve this and install BitDefender, right now I don't have any anivirus on this PC and I'm very vulnerable! 
I also provide a screenshot:
