OK regarding your last post; if you want to get the computer back online, you need to download the driver that I suggested for the built in NIC; Broadcom driver: ~this is the network adapter that is listed in your previous posts.
Broadcom 440x 10/100 Integrated Controller:
The attached image shows which driver to download for the broadcom NIC via DELL.com
EDIT, you have also mentioned you use a wireless adapter by intel; the link for the intel proset drivers above should work with the model wireless adapter showing in your previous posts.
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