I think I finally have the network problem fixed at home. I returned a surge protector to CompUSA yesterday (power switch didn't work) and while I was there I poked around a little and picked up a D-Link 802.11g "gaming adapter" (I think it was the D-Link DWL-G820) and it seemed to be working just fine last night. I still haven't tried it with multiple devices but for now it's fixed my problem.
I'm still sore from hoisting the TV and speakers around on Wednesday. monstersocks accused me of bounding down the stairs last night when in fact I was just hobbling down them.