Have you tried going into device manager and uninstalling the adapter itself, then rebooting and letting Windows reinstall it. It should find the drivers by itself - I'm sure they are on your system. Or it may be the adapter itself gone bad. Try uninstalling it and see what happens.

hi, it does sound like a driver issue. I see that you have uninstalled and reinstalled the driver, where did you get the driver from? The only thing I can think of is to try to find the latest driver for your particular adaptor on the Dell site (if you didn't do that before) and if this doesn't help it does seem to me that the adaptor is broken and will need replacing. Error code 10 when applying to network adaptors does seem to refer to the driver (though that error does turn up with other devices as well!).
hth