Can anyone suggest what I should do to rid my computer of this Trojan?
Here is the log entry from AOL spyware Prevention. (Note, that no
other AV device including Norton, Spybot or Ad-Aware seems to notice
it.) I have even got Symentec's Q-host extraction tool, which doesn't
even recognise this menace. All help gratefully received.

Dat Date: July 28, 2006 5:21:16 PM

Pest Detected on August 18, 2006 at 3:41:41 PM
Pest ID: 453094956
Name: Trojan.Win32.Qhost.df
Location: Key "hkey_local_machine
PVT: 4294967295

Scan Finished on August 18, 2006 at 3:41:45 PM

I am running Win XP Home + SP2.

Thanks a lot.