You should search around a little bit before you ask question. This issue has been addressed at least a few hundred times on these forums. There is no 64-bit flash period. Not for Windows, not for Linux, not for Mac, not, not, not.
There is a FOSS program call Gnash that works for some Flash videos, but not all. I don't know whether or not it's available in Mandriva repositories.
A little reading that would be helpful:
How to ask a question.
Linux is not Windows