a search engine, do you mean a search toolbar in internet explorer, or a toolbar that sit near your start menu, or something else.
There may be an option to remove it through the add/remove programs in control panel, or maybe use some adware removal app, like aware from lavasoft. Or hijack this. http://www.lavasoftusa.com/software/adaware/
Is on the toolbar below the address bar. Is not in tha add/remove program.I put the adware it did'nt any good. Maybe if i can find where is the enable Acive X Control, maybe I can get rid of it.