Check this out might help you
http://www.wilderssecurity.net/bhblaster.html
"Running silently in the background, Browser Hijack Blaster only springs into action when an attempt is made. It watches and protects the following items:
IE Homepage, IE Default Page, IE Search Page, BHOs
Whenver one of the above items is changed, or a BHO is added, you are immediately provided with information on the item, along with the option to keep the change, or revert to your previous settings.
Browser Hijack Blaster also can detect changes between the times it is run. If a spyware application tries to install its BHO at boot-up, and change settings at boot-up, before Browser Hijack Blaster is activated, you will be notified and (like the situation above) given the option to keep the change or to revert to your previous settings.
Browser Hijack Blaster also has a database of values common to spyware programs. If, for example, your homepage is changed to lop.com (a known hijacker) you will not only be notified, but a special notice will be displayed that you probably have Lop.com on your system (and that you should run an anti-spyware program such as Ad-Aware or Spybot S & D).
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