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A Network Cable Is Unplugged" but it's not - Windows Vista, Dell Studio

Peter Hart
Peter Hart asked
Ok last night it was working - shutdown - this morning A Network Cable Is Unplugged" but it's not - so after doing all the obvious (news cables, checking with other PCs the connection)  - I booted Knoppix linux off a CD and sure enough the Ethernet worked and I could browse the internet. So... not hardware not cables but Vista.
I did a restore back 1 day then 2 days - nothing,  I rolled back the etherent driver - nothing - I deleted and un-installed the driver - nothing.
according to the device manager - "this device is working properly" - but still the icon "A Network Cable Is Unplugged" but it's not and fails to even look. ?so in summary,  The linux disc shows the connections and hgardware are working, I'm guessing its an update which hasn't been undone by the restore. so... any ideas??
Watch Question

Uninstall the network card completely, reboot, let vista find the card again and auto-install the driver.
Since you've already ruled out hardware problems, re-imaging the machine would be the most straightforward solution.

Otherwise you could be looking at a driver / OS corruption, malware, etc.
You can also try resetting the TCP/IP stack:

and repairing WINSOCK2:
@tjdabomb - read my second paragraph - done - nothin
@runningGaq - no bit of a sledge hammer to crack a nut ? - last last resort..
@drewha1969 - the TCP/IP and the winsock are ok - but I did them anyway but nothing.
However - while I was on the microsoft site I search there for the answer and got it!!
from following article: http://support.microsoft.com/kb/910389/en-us
so thanks Drew you lead me to the right site :-)
thanks it took me to the site with the answer
 here :
Top Expert 2009

what's irritating was the PC has been working for the last year prefectly fine - thne one day it happens
it was step 5 and 6 in this article that  http://support.microsoft.com/kb/910389/en-us
fixed something that wasn't broken..... software....
Glad I could help!