I am running an XP SP3 guest on a 21" iMac with 2.7 GHz Intel Core i5 processor and a AMD Radeon HD 6770M graphics card with 512Mb. I am using OS X v 10.7.4. The VBox Manager Display section indicates 64Mb video memory with 2D Video and 3D acceleration. I try to run a specific game from Sonalysts, Fleet Command, and get the message "Failed to Initialize Graphics display". Does anyone know how to resolve this issue?