fsx runs like crap

I just installed FSX acceleration today and I tried to lay some missions but they all freeze up and the graphics look like crap
my specs are:
MSW XP Professional service pack 3
Intel pentium 4 CPU 2.40GHz
2.39GHz, 512 MB of RAM
and im not sure on how to find out what my graphics card is
help?
also the cockpits for all the acceleration planes are not showing up. i have to press the W key to change it to the slimplified version. how can i get the actual cockpit?
my specs are:
MSW XP Professional service pack 3
Intel pentium 4 CPU 2.40GHz
2.39GHz, 512 MB of RAM
and im not sure on how to find out what my graphics card is
help?
also the cockpits for all the acceleration planes are not showing up. i have to press the W key to change it to the slimplified version. how can i get the actual cockpit?