Wizard 101 on a MacBook, Display memory issue

I'm getting a white screen when I try to launch Wizard 101 on my MB running Boot Camp and Windows 7. (Wizard101 is a game.)

Wizard101 tech support says:

"Thanks for the DxDiag. I'm sorry to be the bearer of bad news, but you will not be able to play Wizard101 with your current hardware. Your graphics card only has 8MB of display memory, while the game requires at least 64MB of display memory. You will have to upgrade your computer before you are able to play Wizard101. Sorry for the inconvenience."

So, how do I up the display memory? (On a PC this would be done via BIOS; not an option in my situation).

Please accept my gratitude in advance for your helpful response.