Well... you could physically "turn off" the wireless card. If it's a notebook there's probably a button to let you do this somewhere (I think you mentioned at one point that this is a high end Dell notebook, no?). If it's a desktop I'm not so sure what to suggest.
You *could* alternatively go into your Device Manager and disable the wireless card.
I dunno - none of these are real solutions, just bandaids. Hope you find a proper solution soon!