Windows 7 - [ask]VGA/GPU on Virtual XP

hello brothers and sisters
this is my first time making a thread here
well i've searched for this topic but i found nothing

i'd like to ask, i want to play dungeon Siege 1 Legend of Aranna so badly
in the real windows 7 x64 there is an issue with the mouse pointer disappeared when i open inventory..... after searching for a long time i found nothing
so when i accidentaly take a look at some forums, they said that if you want to run incompatible software in Windows 7, virtual XP is the best choice

now i've installed the virtual XP
but i've a problem here
because the GPU isn't recognized, i couldn't play it
when i look at settings, there is no choice for display
and then i tried to install my VGA driver, it's HD 6950 but nothing happened...

anyone can help?
thx