Crossire doesn't launch

Hi all, i got a problem with crossfire, when I'm launching it, I see the menu -> click "START GAME" -> I see XTRAP and game watcher loading and then --> NOTHING : /

i reinstalled few times but still don't work
My computer is old and have about 450 RAM ( but some games with minimum 512RAM work perfectly) so i think crossfire should do the same
and my graphic card is ATI Radeon

should it work or should I buy a new computer ??
Help me please