Vista (host) XP (Guest) - video acceleration don't work

[RobitailleFan]

HI everyone
and sorry if I post a question already answeared. Also sorry for my bad english (I'm italian).
With new 3.0.0. release of Virtualbox the video acceleration is now enable, but I'm a software (Microsoft Train Simulator) that when I launch don't work, and it return this error message:
"Train Simulator require hardware acceleration"
I correctly checked the "Hardware acceleration enable" in Virtual Machine Option, and also I correctly installed (in safe mode) the Guest Addition.
Is there any solution?
My system is:
Host PC: HP Intel Core 2 4300 @ 1.80 GHz Windows Vista Home Premium SP1 - NVidia GeForce 7500 LE
Guest OS: Windows XP SP1
Thanks for all the answears.

[stefan.becker]

Is Direct 3D in "dxdiag" enabled. If not, install Guest Additions in windows safe mode (F8 at boot).

If that doesnt help, then forget it. 3D in VM is very crappy.

[RobitailleFan]

Thanks Stefan, but as you suggest "I'll forget" because don't work. Thanks anyway