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We have an IBM sytem x3650 MT 7979 running as a Vhost. I verified that the machine that we bought has a 64 bit architecture but it was configured as 32 bit. the vhost has allocated 4 virtual servers that runs on 32 bit windows OS platform. If we want it configured as 64 bit, is there a detailed instruction on how to do this? Someone told me that we need to reinstall the hypervisor?

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You're going to have to reinstall.....

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Yes, both the host OS and the VMs. There are no cross-architecture in-place upgrades for Windows. –  jscott Jan 10 '13 at 3:07
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