can keynote works on a virtualbox? problem of VRAM

Hello,

I have a pc with windows 7 operating system and I wanted to use the keynote application. I and install mac os x on my virtual machine. After I bought the keynote application and I installed it. Unfortunately, at the opening, after the choice of the theme, I do not see the slides where I have to write ... When I do diaporama, an error message tells me that "Your computer may not have enough VRAM video memory to play the slideshow at the current screen resolution". Note that I dedicated 32 MB video memory when configuring my virtual machine.

Please help me. This is very urgent!