Installer for Windows Server 2008R2 blue screens under Hyper-V 2012

Trying to build an SQL Server cluster lab on an old Dell Latitude E6400 with 6gb RAM, using Hyper-V 2012. The install works great, I can create VMs and networks just fine, but when I try to boot the 2008 R2 install ISO, it blue screens like the screenie below.

On occasion the first number in the brackets is 0xc000012d.

It loads files off the ISO, displays the "Starting Windows" screen without animation, goes to the Vista loading bar before displaying that message.

I've run up every update that was available and even tried turning on the old OS option under Processor, to no avail. The same happens with or without SP1 in the 2008R2 ISO.

Any pointers or cluesticks will be greatly appreciated.

Found the problem - the SQL servers booted just fine, and the reason was that, while dynamic memory was turned on, the lower bound was set at 256mb, which, it turns out, is not enough memory to load the boot.wim file into memory. As soon as I raised the minimum to 512mb, it was fine.