Adobe already have an experimental 64bit version out, however you are probably better sticking with the current releases and using a 32bit browser. Most browsers will be available in 32 bit versions.

For more information see this helpful Adobe article Flash Player on 64-bit operating systems

You may try right clicking screen, then "personalize" then click "classic". This works for programs that have not upgraded to 64 bit. When you finish do the same but click on "Windows 7" to return to 64 bit screen.