Adobe Flash 11 and Safari

Is anyone having problems with the new update?
I try to update mine and it keeps on asking to quit Safari even if its closed.
Even tried force quitting it, restarting Mac, and none of those worked.

I tried downloading new Flash11 dmg file but still didnt work.
It keeps on giving me that "Please quit Safari before install".
Even after I hit "retry" it gives the same message.
Installation stops around 50%.

Anyone aware of this issue and knows how to fix it?
Thanks.

EDIT: Forgot to mention, running Mac OS X 10.8.3 on 2011 MBP.