My manifestation of the scagent trojan was Norton notification of a digfilt.dll file that it could not remove. I used the instructions from the following link and was done in about 1/2 an hour. Rescanned PC with no more virus/trojans.
http://free.grisoft.com/freeweb.php/doc/7/lng/us/tpl/v5/idn/0b36adb65f740000
Good Luck.
Kenji
