Downloaded the chipset & network drivers. No dice. It's not the first time I worked on this model. I had the Resoure CD then. Dell did not have it listed in the past under this model. The reason for so many present complaints in their forum. Microsoft responded via email right after I posted this issue..4 hours later. : )
I was able to access their forum and get a direct link for the controller. It's available under another/compatible PC model...but the info in the full link shows '4600c.' Web page developers need 2 wake up! Thanks for being on top of things though.
http://support.dell.com/support/down...1&fileid=84196