Realtek 8169 Not Recognized by Computer Since Deep Sleep Mode

I have laptop of Toshiba Satellite A665-S5170 which came with Network Interface Controllers of 10/100/1000M Gigabit Ethernet PCI RTL8169, everything was working fine , but once when my computer went to sleep i am not able to find my ethernet card in Device Manager, also i had option clicked to Allow this device to turn off to save power.Now i have plugged in cable on Ethernet adaptor yet it doesnt works , i have latest drivers from the Official Website of Realtek and I just reinstalled Windows. Normally Windows 7 detects the NIC and I just have to install the driver from the CD, but now it's like the whole thing have disappeared. When I try to install the driver an error comes up saying "The Realtek Network Controller was not found. If Deep SLeep Mode is enabled Please plug the cable". I am deeply annoyed too because i have been stuck in this problem since March 2012 now its August , it had been 5 months, I will be deeply obliged to receive your help and screenshot is also there.
Regards,
Muhammad Waleed Mirza.