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ESXi is VERY picky, even on real hardware, on its requirements. Their HCL is very strict and I am almost certain that is the problem. I just built...
Tough one. If you upgraded the OS (XP) to Vista, that could be the issue. You could potentially create a new Vista VM and start the install from...
All you need to do is to enable it under the Virtual Machine configuration. It is under Coherence (see attached screenshot). CR