Adobe Flash Player 10.1 was released 6/10/2010. It did not include the 64bit upgrade to support IE 64bit. However, there were bug fixes and a few minor upgrades. To download the latest version of Flash Player for Mac or Windows, follow this link:
There is currently no timetable for the next "major" release of flash player that will incorporate 64bit browser support. Until then run your internet explorer located in the program files x86 folder.