Installing Flash Player fails due to 'close Safari' erro

Hi,

I have just downloaded the latest Flash Player onto my mac, but whenever I try to install it, the program comes up with the message 'Safari must be closed' to continue. I have closed all the Safari browsers but after clicking retry I am prompted with the same error. I then tried re-doing the entire process with all Safari browsers closed, but I am again prompted with the same error.

Is there a way to get past this?

Any assitance would be really appreciated,

Thankyou

Kimberley