Network Driver Problem and Brightness Problem in Windows 7

windchimes

Can you hear it..??
Hi guys,

Got two issues pestering me quite a bit, and hope someone can guide me to fix them

1) My internet (connected over LAN cable ) gets disconnected each time I reboot the laptop and
I have to install the network driver every single time. Know why this happens?

Machine - Dell 3543
OS- Windows 7 Ultimate
Driver - Realtek RTL8106E-US & RTL8111G-US Ethernet Controller Driver

2) The screen brightness can't be reduced by the given key combination of
Alt + F11 and Alt +F12 as marked on the key pad.
 
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