From Thursday i am facing this problem. When i start my pc the bios doesn't recognize my either hdd and in the following screen the message appears "disk boot failure, insert system disk and press enter ". After restarting my pc about 9/10 times only then my operating system loads.

While all this is happening my network adapter isn't detected at all. The notification area in desktop where there is the lan sign it shows a red cross. This lan issue has been posted by me on another thread but i am summarizing all in one. I tried installing my network adapter from the original motherboard disk but an error message appears "windows can't verify the publisher of this driver software ". I tried installing with latest drivers but then this message appears "the Realtek ethernet controller was not found. If deep sleep mode is enabled please plug the cable ".

Windows has been formatted but the issues persist. i have also opened the cmos battery, cleaned it and again put it back.