Error: Unable to obtain hardware information for the selected machine.
Like any respectable sysadmin, I googled the solution, but I could only find vConverter stand-alone issues regarding VMs registered as Windows 2008 R2 and software not being able to handle that, so a change to Vista 64 was needed. However, this was not the case.
Digging in the VM settings, I was able to find problem. It was in the NIC configuration. Somehow something changed it and left the distributed switch assigned, but not the port. I looked like this: