I just got a laptop Compaq Presario CQ42 which running Core i5 processor with ATI Radeon HD5430 (3D Graphic Card). With 4 vCPU which showing in Task Manager (Duo core 2 with Hyper Threading enabled) was fantastic but when you install Hyper V, it will cause issue such as BDOD or slow performance.
Checklist of what i have did:
Y - Upgrade BIOS
Y - Install latest driver
Y - Confirm is the correct VGA driver
Still got BSOD error message telling about Video Graphic card driver issue.
In order to solve this issue, i use Standard VGA driver to run Hyper V. A bit dissapointed but what's the heck as long i can run Hyper V in the laptop. Still unsatisfied, so i decided to looking around using Google. i have found an article written by Ben Armstrong, Virtualization Program Manager (http://blogs.msdn.com/b/virtual_pc_guy/archive/2009/11/16/understanding-high-end-video-performance-issues-with-hyper-v.aspx) which discuss about this issue. Besides BSOD, it will also give slow performance issue if you manage to install the driver. For more detail, please refer to http://support.microsoft.com/kb/961661 .