Unable to detect my LAN card

Hi,

I have IBM think pad T60p and I have newly installed OS and some applications and it was working fine for more than a week. Suddenly from yesterday when i switched on my laptop for the first time the network card was not detected and also I am not able to connect to the Internet.I am not able to open the my network connection.I have logged into the safe mode uninstall the LAN drivers. After restarting it works fine. The next morning when I start my laptop the same problem arises.What might be the problem?
kindly help

Ananth