Hi
Lets see what we can do.
First install the Chipset Driver:
http://support.dell.com/support/down...7&fileid=56457
Lan Driver:
http://support.dell.com/support/down...5&fileid=66981
I know you have downloaded it before, but please do so again. I had the same issue the other day. I ended up redownloading it and had no issues.
Once you have internet access run Everest under my signature and attach the report to the thread. The report will tell me what hardware you have.
Thanks,
Bill