Another Zeroaccess!inf infection

I am using Windows XP professional with Service Pack 3 on an Compaq V6000 (x86). Norton picked up the Zeroaccess infection and recommends manual removal.  It looks like I have 2 infected files:

 

C:\windows\system32\tshwmdtcp.dll

C:\windows\system32\parport.dll

 

 

Any  help would be appreciated.