"Flash player for vista(64) bit" - This title is somewhat confusing and misleading.
You "can" use Flash Player on Vista 64, "IF" you use Vista 64's 32-bit version of Internet Explorer. To use Vista 64's IE32, go to "Program Files (x86)", "Internet Explorer", look for "iexplore.exe", from there you can create a shortcut on your desktop or link it to your keyboard like I do.
And no, you can't play flash files on Internet Explorer 64 because Flash is not 64-bit compatible. And yes, I tried the method posted by dinesh. And If you "do" have flash playing in IE, then check the version of IE by going to "help", "About Internet Explorer" and see if it states it's the 64-bit version?