Alternatives to Proctor U for Straighterline?

[Nixi]

1) I don't like the idea of some stranger having potential access to my personal files on my laptop. So, I would need to purchase a second laptop to use just for Proctor U exams.

If it makes a difference to you, ProctorU uses LogMeIn's software, and you can see exactly what they're doing--your session terminates once you close the chat. If not and you have no other options beside ProctorU, maybe you can install Linux on a separate partition on your current laptop or use a virtual machine.