Trojan.Zeroaccess!inf virus c:\windows\system32\netbt.sys

Norton tell me that I have contracted the Trojan.Zeroaccess!inf virus. File netbt.sys in "c:\windows\system32\drivers". Norton delete the file but after I reboot the file come back again and Norton find it again and again. Can somebody help me out on how to get rid of this thing?  I am not able to connect to any of the other computers on the network. I am on Windows 7 32 bits

Please help!!

Thanks in advance.

 

Sebastien