I had the new version installed this last time I updated and after installing it, updating, and immunizing, every time I go to run a system scan with it, nothing happens (as in the progress bar never appears). It acts like it's scanning since the "scan now" button changes to "stop scan". However, nothing happens and it just sits there. I tried uninstalling, re-downloading the newest version from an alternate mirror, but still no luck. What can I do?