Is an ethernet card an ethernet card an ethernet card? I'm trying to change DSL modems so I can add the second computer. I assumed (mistakenly?) that I wouldn't have to change to the new card that came with the new modem and went ahead with the install. I can get connected this way but the puter acts like crap. Clock randomly stops, mouse disappears in and out, timer pops up for no reason, pages won't load like I'm off line when I'm not. Maybe the solution is as simple as "you need to change the card stupid?