What I've done in the past to get rid of hijackers and their .dll's is to....
1)run adaware and get it's exact location. You can run a search from the "Start" but you're doing 2 things...finding it and making sure there's nothing new!
2)Once you have the location, find the .dll associated with the program/s.
3)change the .dll to .dl1.
4)deselect and remove all of the offending garbage that Adaware found.
5)restart the computer.
6)delete the offending .dl1 file.
7)run adaware again.
8)restart the computer.
Email me before you go through the headache of reinstalling the OS.