Certainly not yet. The problem may be more down to the limitations of the checker.

Although when I look at the listing of installed plugins listed aside in more system information I note two Director plugins, you should not have two, and in fact you probably do not need that at all. The standard Adobe shockwave FlashPlayer is probably necessary but not the Director ones.

You could try uninstalling using Windows Control Panel, but you may need to use a special Adobe utility to uninstall all their related software, then reinstall FlashPlayer for each of your browsers.

That depends. There are those for secure banking that you want to keep. So goggle and check who administrate it and if it's considered a threat.

Absolutely. I would not delete them, I have a couple unknown add ons that I am comfortable with, such as iTunes application detector and google update. They shouldn't be dangers but like Gnospen said, go see who they are by and check if you like them.

Have a great day!!

Jon