|BHO is simply put a Browser Helper Object and everything from toolbars to spyware and other various program's that watch your Internet Activity (some invited some RAMMED down your throat)!|
Make sure it is something you really don't want before you go and remove it .
It will not remove usually because it is still running in the background (if a Browser window is open then so is the program)click run type msconfig in the box go to startup and find the little nasty there (this will prevent the Reinstaller from loading at boot time)
Right click the clock and open the task manager click processes find it there and turn it off !
Click tool's (on browser window)then Internet option's then program's then manage addon's find it there and disable it !
Now reboot in safemode and do not open a browser window and run your scan again and let your antivirus (or whatever tool you where using that alerted you to the BHO)do it's job and remove the little nasty !