Try the following tool from Symantec:
http://securityresponse.symantec.com/avcenter/FixAprop.exe
..
If you have either Norton or McAfee installed (AV), they
can detect and remove this as well. Spybot
(
http://www.download.com/3001-8022_4-10401314.html?idl=n)
and Ad-Aware (
http://www.download.com/3000-2144-
10045910.html) can also detect and remove Apropos, and I
think that ewido (
http://www.download.com/Ewido-Security-
Suite/3000-8022_4-10326287.html) can also detect and
remove Apropos. Make certain to downlaod all the updates
for the apps and boot into Safe Mode (press F8 before
initial Windows screen during boot/reboot, press F8 again
to get to advanced option menu, and select the Safe Mode
option that only states Safe Mode). Now run a full
system scan with each app, making certain to remove what
it finds before running a scan with the other apps. When
installing ewido remove the check mark next to ewido
guard and the auto-update feature. Updates for ewido are
provided daily, so update often.
The problem when trying to remove this malware is that it
uses registered .dll files that must first be
deregistered before you can remove it, otherwise the
removal WILL fail. This is why many apps fail to remove
these types of infections.
One more thing. If you are running XP, delete the entire
contents of c:\windows\prefetch just to be safe. YOu
might have to do this in Safe Mode.
Alan