After following all those posts and replies and updates, you and chrisnova had installed Cubase 6.5 Trial which would have installed the elicenser driver (which tries to detect the USB port for Steinberg key), then when you installed Elements trial. IMO, that LLC driver is still looking for USB key. Try to uninstall completely, Elements 6, cubase 6.5, soft-licenser, LLC, syncsoft, etc... Try to delete the registry keys. I don't know about Mac but in windows you can apply run command with 'regedit' and select find options and type each related names which can search any keys or data related to what you typed( for example, elicenser).
Try this and restart your computer and try to freshly instal your Elements 6 trial.
Let me know if it helped.
i7 920 2.67Ghz. X58 Intel Mo.Board, 12GB DDR3 RAM, 512MB MSI PCIe 16x, Cubase 6.5.4, Halion Sonic, Halion Symphonic Orchestra, QL-Silk, Geist, M-Audio FW 410, PadKontrol, Nocturn, Triton.