Adobe dropped support of processors without SSE2 on Linux (you can check
with "grep ^flags /proc/cpuinfo" the letters "sse2" should be in the
list) in an early point release of Flashplayer 11. The player will
install, but then crashes when it is invoked. This mostly affects older
32bit AMD processors. You can install Flashplayer 10 from Adobe, see
http://bugs.debian.org/697339