Using an Ethernet Adapter for Internet with my Emac - getting IP problems

Hi, I used this Ethernet Adapter just fine with my laptop, and now have everything migrated to an EMac. Using 10.4.11, so everything is the same. But I get strange drops (Gmail even told me I had a 'flaky' internet connection) and have to launch Network and am usually told (under Network Status):
Ethernet Adapter (enl) has a self-assigned IP address and may not be able to connect to the Internet.
I can sometimes get it working by hitting the Renew DHCP lease or Configure IPv6 and Apply Now. Sometimes that doesn't work, but if I switch to another User it starts working correctly, and is fine when I return to my preferred user. Sometimes nothing works until I restart. It's frustrating, because it is time consuming to fix and I never know when I am going to be dropped. This never happened with my laptop, so I am pretty sure it's something in my Network pane.
Thanks, ahead of time, for any suggestions.
Any suggestions?

I did reinstall the software, but your question got me to thinking ...
I had the problem again after I turned off the computer for an hour, to do some RL stuff, and when I turned it on I got the "self-assigned" IP report again. The IP6 was off, so that wasn't the only issue. I did a renew lease thing, which did nothing on my usual User side, but when I switched to the other User it worked again.
So I'm wondering ... the User side I am mostly using was the one that migrated over from the Laptop. The one that tends to turn it on is the one that had a User installed on it already. Maybe some setting migrated from the Laptop. Perhaps I should try deleting the software, and reintalling it from the CD. It seems to be affecting the IP selection, somehow.
The other thing is maybe I should just put in a manual setting on the IP, the one the dongle seems to like. I'm wondering if IPs are being reassigned by the router in the main house and that's why mine goes bonkers for no reason. Only thing is ... that never happened when it was just on the laptop.
Hey, thanks, Kappy, for all your help. I know it's tough when you can't see exactly what I'm talking about.

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