Moving this discussion to the Installing Flash Player forum.
What is your operating system, version & edition?
What is your web browser?
Can you provide a screenshot of that message?
I have the same issue. 2 days ago I upgraded (at Adobe's recommendation) my Flash Player (which was working fine!)--now I can't get anything except the message "Blocked Plug-in". And, I called Adobe almost an hour ago for assistance, told they would call back in 12-17 minutes, but here I am still waiting. This same thing has happened to me before and I cannot remember how it got fixed. I'm thinking Adobe may not be the best company with regard to servicing their products.