Execute Disabled Bit
Well i tried installing 2012 on an old server i had that was a P4 Based Xeon but it fails to install with 0x0000005D error which means that Execute Disabled Bit is not enabled.
Turns out my CPUs are too old to support ie :( i had SL7HF and whilst they had EM64T they don't support Execute Disabled Bit, so I'm trying to find some that i can put in there place i tried some SL8MA but despite the intel board processor compatibility list saying they should work they don't like my board! hey ho..
Its one to watch out for!