Unable to remove Trojan.Zeroaccess!inf4

Hi there

 

My computer has Trojan.Zeroaccess!inf4.  I have run Norton 360, which is unable to remove this trojan.  I followed the instructions given by Norton for manual removal, but this has proven to be unsuccessful.

 

Any advice / help with this would be hugely appreciated.  The computer is Windows 7, Dell 3300 laptop.

 

Thanks

 

David