When I configured a new template in VMware Labmanager I got a blue screen of dead with a stop code 0x0000005D. I knew that de ISO I was using was fine because i used it with in vCenter a few times.
The solution is easy I just forgot to choose the right virtual hardware profile. The default of VMware Labmanager is Windows 2003 and I had the Windows 2008 R2 CD mounted.
You can choose the right hardware profile at the properties tab and than select the appropriated Guest OS.