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I installed a Windows 7 professional 32 bit guest on a windows 8.1 hyper-v image. When I go to the settings and change the virtual processor count from 1 to 2 it no longer boots. Unless, I first use msconfig to limit it to using one processor. However, as soon as I remove that contstraint it again fails to boot.

My question to the gurus out there in serverfault land is how can I get my windows 7 guest to boot with 2 virtual processors. This is a build machine with complex software that takes days to put together so I am really looking to not have to reinstall just to add another virtual processor.

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  • Sounds like you're in dire need of a configuration management system.
    – EEAA
    Apr 11, 2014 at 21:51
  • I don't know what that is, but it sounds horrible if you need a 'configuration management system' to add a vCPU. Apr 12, 2014 at 3:48
  • I assume your actually processor has HT support and has more then a single core?
    – Ramhound
    Apr 12, 2014 at 4:02
  • My processor is a Core i7-2860QM CPU @ 2.5 GHz.
    – Joseph
    Apr 24, 2014 at 15:03
  • I have verified that a new installation from the exact same installation media works with 4 virtual CPUs.
    – Joseph
    Apr 24, 2014 at 16:22

1 Answer 1

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This may be very obvious, but I had a similar problem with a VM after I replaced the motherboard on my computer. The new BIOS setting for Hyper-V was disabled. When I enabled it, my problems went away.

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  • I just checked and intel vt and intel vt direct i/o are enabled.
    – Joseph
    Apr 24, 2014 at 16:18

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