isearch is actually pretty intelligent (for spyware). It blocks access to the lavasoft site, and if you already have ad-aware installed, it blocks the web-update feature too. It further infests your machine by disabling your access to the toolbars in IE so you can't customize them or rearrange them.
It is just ugly, and must be removed. To do so, you'll need to either do it manually (kind of a pain in the arse) or via ad-aware. You can obtain ad-aware and the latest reference files from here:
http://lavasoft.element5.comIf you can't get them, send me an email jonny_bravo at comcast dot net. I'll hook you up.