i have installed mafia 2 on my xp
other specs are 1gb ram
ati radeon xpress m200 card
working sound card
latset directx runtime installed
it starts to load shows splash screen then a blackwindow with hourglass but then crashes to desktop without any error message.
would adding ram and a physx card help
Go to http://www.systemrequirementslab.com/cyri/
choose mafia 2
You would be amazed with the results
But it will help you to know of the reqs.
As suggested above a major upgrade is necessary to run the game.
Do list your full specs..