Re: Where can I get/extract vmxnet3 x64 drivers (from ESX 5.5) for 2012 Server R2?

C:\Program Files\Common Files\VMware\Drivers\vmxnet3

FIrst your will need edit settings to remove your adapter, then add the vmxnet3.  If you already have VM tools installed it should just install the vmxnet3 nic at boot.