Firefox disabled by flash plugin telling me to update to new version. I can't update to the lastest Adobe flash player 11, because it does not support Windows Vista 64-bit. So now what am I supposed to do?

I have Windows Vista 64-bit. I can't play on-line games on Pogo. I already contacted Pogo & they told me to update flash player. Firefox disabled by plugin for flash. I can't get the most updated Adobe flash player because it doesn't support 64-bit.