Finally fixed a big-time memory issue, but ever since have had difficulty getting a stable internet connection. The system will show the network but rarely connects to it. (Though router is downstairs and through some walls, distance is probably not the cause--same computer/same location used to connect and a laptop sitting right next to it in the same room always connects with 4 or 5 bars.)
Connecting to a D-Link 802.11G router wirelessly.
Attaching IPCONFIG info below.
Thanks in advance for your help!