if u r a newbie to linux and basically want to use it to watch movies and listen to music, then mandrake 10 IS the best...
it has many tools and a cool interface....it also has tools like mplayer, xmms and xine to satisfy ur need for entertainment.
for the complete package list in mandrake 10, go here, *www.mandrakelinux.com/en/10.0/features/15.php3
i dont know if the usual mandrake 10 supports 64 bit processing, but there is a separate mandrake 10 for amd 64 which also suppors 32 bit applications.
*www.mandrakesoft.com/products/10/amd64