HijackThis.exe
I have seen some very bad Spyware and Adware, most of these
are exe and dll. They are not detected by the most popular
Anti-Spyware or Adware software. There is a utility out there
called "HiJackThis". If a person has a "nasty" script that just
wont go away (even after running Anti-Adware programs),
one can run this and see what program is running and remove it.
Jim