Disappearing Network Connection

[John Tweedy]

I previously posted this on the "general" new group without success. Any
help would be appreciated.

My friend is having trouble with her Dell Latitude D820 laptop running Vista
Home Premium. She takes it to her daughters house and connects wirelessly
without a problem, but when she returns how home and tries to connect using
the wired connection her ethernet device has disappeared from the device
manager and she can no longer connect to a wired network. The only way we
can get it to work is to restore the laptop to the earlier time when the
wired connection did work.

While the ethernet device is missing, I have done a scan for new hardware,
but nothing is found.

Unfortunately, because it's an OEM install of Vista, Microsoft will not help
and Dell says they can only help so far and then they are not trained.

Does anyone have any suggestions as to how this problem can be fixed?

 

[Guest]

Many of Dell's laptops are set to disable the network card on battery to save
power,
however the card will remain enabled if a network cable gets connected.
There are two ways to overcome this setting, firstly, go to Control Panel,
and look for Internal NIC Configuration or use the Quick Set software. Let
us know if this resolves your issue