And if you have a decent and up-to-date anti-virus, you probably won't be able to run a TDL installer at all. Your anti-virus will probably block it.
hum.... ça me laisse songeur. ;O)
Even if you're unlucky enough to get infected, cleaning up isn't too arduous. Many anti-virus programs - including from Sophos and from various of our competitors - can sort out a TDL infection for you.
jamais vu ça...