Has anyone ever heard of any problems installing Windows Vista Ult. on Msi Boards? All three of my msi boards refuse to let it install. During the very first screen you get when booting from the disc after a min or so it blue screens with a acpi error. At first I though maybe it was something it did like the first board. Second board did the same thing. I though maybe since both of them had basically the same chipsets maybe there was some weird issue there. But now with third board it does the same thing. I though at one time maybe the disc was screwed. I tested it on my gigabyte board and it works fine. Also every other board it works find even the A8n Sli board. Now the kicker is Vista Home premium installs fine on all three as does Win7 and Win8. I can't wrap my head around that one. The 3 boards in question are a 790x-G45, 790xt-G45 and a 870-G45. The Gigabyte Board is a GA890Xa-ud3 which uses the same northbridge chipset as the 2 790 Msi boards I have. It does have a different Sb chip. The Msi boards all have a 710 sb chip where the Gigabyte board has a 850 Sb chip. Whether that is where the problem lies, I have no ideal.