Also need help with removing trojans

I have been recieving multiple warnings from NIS about the presence of the following:

Trojan.Gen

Trojan.Gen2

Trojan.Zeroaccess

Trojan.Zeroaccess.B

Backdoor.Trojan

 

Prior to finding these discussion boards I followed the NIS removal instructions and ran a full system scan and used the Norton Power Eraser in safe mode which found and removed the following:

mchlnjDrv.sys from C:\Windows\system32\Drivers\mchInjDrv.sys

This is apparently not the cause as once restarted the same warning messages from NIS still appear.

 

I am using a Dell Inspiron 1525 and running Windows Vista, 32bit sys.

 

I have a flash drive and will follow all directions closely. Please Help!