We’ve recently seen an issue running Windows Server 2008 R2 with the Hyper-V role installed on an Acer 6593G laptop. We’d updated the BIOS to the latest version available from the Acer site (1.16 at the time of writing) and Server 2008 R2 would no longer boot once the Hyper-V role was installed.
Rolling back the BIOS to the 1.11 version solved the problem.
We’ve also tested the 1.09 version, which seems to work okay, but have yet to try the 1.13 version which is also available. I’ll update this post when we’ve tried the 1.13 version.