While another computer was not able to connect to the internet, I tried connecting it to a laptop that did have a good wireless connection using a Network Bridge. (All operating systems are Win XP.) On the laptop, I created a Network Bridge between the wireless network connection and the local area connection. After plugging in the cable and seeing that the bridge didn't work, I dropped that idea and then totally reprogrammed the wireless router in order to get the PC up and running on the internet. When that worked for the PC, I tried to change the settings on the laptop to use the new settings of the wireless router, and I received limited connectivity. I remembered the network bridge and went and deleted it. But I have not been able to restore connectivity. I've turned everything off (cable modem, router, PC, laptop) and turning them back on one at a time (and repairing the connections), but that has not worked. I have also gone into the connection's properties and deleted the preferred network profile for the previous router settings and the newest settings, and forced a fresh connection where it asked for the passphrase.
Some other details:
The PC and two Tivos are currently successfully using the wireless network, but laptop can't connect to it.
The wireless network was set up as WEP before my troubles. When I reprogrammed the settings of the router, it defaulted to WPA and I tested that the PC could connect to the internet in that mode. (So for a while, the router was on WPA while the laptop was on WEP.) Then I changed the router to WEP and verified the PC worked on that. Only then did I go to update the settings on the laptop when it wouldn't work.
What did I screw up by trying a Network Bridge?
Thanks in advance!