I am running on Windows Vista and use Firefox.
I had been using an older version of Adobe Flash Player, but starting getting some warning messages on youtube videos and such that my player was out of date (certain things would not operate on other sites). So, i downloaded the newest version of the flash player, and now nothing that requires it will operate on Firefox. Because it seems to fix many things I don't understand, I did a system restore to a few days ago, but the problem persists. I then told my flash player to update itself, which it did, and it still won't operate.
How do I make it work