Did you install a ‘browsing speedup’ or ‘browsing enhancer’ program. This is one of the ways that “advancedenhancer” gets onto your system. Do you have an Antivirus product on your machine, and if so, what is it? See
Now for safer browsing practices:
**If you just have to use Internet Explorer..
1. On the general internet zone and untrusted sites, disable ActiveX (activeX controls on others – disable all options for it, even signed.). Only allow ActiveX for sites that you trust 100% with your machine. ActiveX can be used by the webserver to do almost anything to your machine. There was a website that showed how bad ActiveX is by using a signed ActiveX component to shut your machine off when you browsed a specific link. ActiveX can also be used to alter just about any configuration on the machine or install software without your knowledge.
2. Disable Java and possibly JavaScript(active scripting on sites in the Untrusted region. Personally I would also disable Java on the general internet sites too..
It is better not to use Internet Explorer. As mentioned earlier, use Firefox. Also add in the NoScript plugin for Firefox.
There are more settings on IE that should help lock it down, but the 3 above should help a lot. Unfortunately a lot of websites like to use ActiveX.. they shouldn’t.