Hallo Jen,
die Costa Brava wuerde ich schon gern mal kennenlernen 
Der „Deep Sleep Mode“ sollte im Gerätemanager deaktiviert werden. Hier ist beschrieben, wie es funktioniert (im Power Management innerhalb des Gerätemanagers):
http://www.tomshardware.co.uk/forum/37083-17-major-i…
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click start then shutdown to completely turn off the computer
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unplug the power cable from wall or computer or both
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press and hold the power button for 10 to 20 seconds (while hoding it pressed you may hear the fan run or some LEDs light up, dont worry dont let go of the button keep it pressed for 10 to 20 seconds)
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After you have let go of the button, leave the system as is for about 10 min (dont plug any power cables in or do anything, go have a cup of coffee)
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After 10 min have passed, plug in the power cable in the computer/wall or both and then power on the computer.
When the windows boot this time hopefully your card will be detected. And will begin to work.
Only once the card begins to work follow these instructions to make sure that it doesnt happen again.
Goto device manager again,
expand the network adapter tree
select your network card (double click to open its properties)
Select power management tab
UNCHECK “Allow the computer to turn off this device to save power”
Möglicherweise ist das die Lösung für die Realtek-bezogene Fehlermeldung.
Viel Erfolg,
Thomas