"New Hardware found : Network and Computing Encryption/Decryption Controller" !!!

 I am facing a problem from last 2 days with my Dell inspiron 6000.
 When I rebooted my machine day before yesterday, it gave the following message -
 "Found New Hardware: Network and Computing Encryption/Decryption Controller" and then it prompts to install the drivers for the same.
 I cancelled the same and then I tried to connect to internet. Then I found the internet connection is not there.
 When I checked the "Network Connections", I found that Ethernet Adapter connection is missing.
 It was working fine till the time I rebooted and all on a sudden the network adapter is missing.
 The ethernet network adapter was Broadcom 440x 10/100. I tried to install the drivers for Broadcom 440x, but the network card is not recognised.
 I tried to reinstall all the driver files but still there is no use.
 Everytime I reboot the machine, I get the same message "Found New Hardware: Network and Computing Encryption/Decryption Controller" and it prompts to install the driver files for the same.

 Any idea why this is happening ? Can you tell me whether some hardware like this really exists.. if so where can I download the drivers. I tried all the drivers in Dell site.. it didn't help

 

 

Please help me to solve this problem.

 

regards,

 Prasanth