Internet Explorer - Files Installed by Yahoo Toolbar on Your Windows System

Whenever an Internet Explorer (IE) browser add-on (toolbar) is installed, you should check your system to see what files are used by this add-on tool, and how it is configured on your system.

What files are installed by Yahoo! Toolbar? Using the file explore, you should be able to find the following directories:

C:\Program Files\Yahoo!\Companion\Data\*.*
C:\Program Files\Yahoo!\Companion\Icons\*.*
C:\Program Files\Yahoo!\Companion\Installs\*.*
C:\Program Files\Yahoo!\Companion\*.*

How Alexa Toolbar is configured on your system? Using HijackThis, you should be able to find the following extra lines in the HijackThis scan report:

C:\Program Files\Yahoo!\Companion\Installs\cpn1\YTBSDK.exe
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search 
   Bar = http://us.rd.yahoo.com/customize/ie/defaults/sb/...
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search 
   Page = http://us.rd.yahoo.com/customize/ie/defaults/sp...
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default
   _Page_URL = http://www.yahoo.com/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default
   _Search_URL = http://us.rd.yahoo.com/customize/ie/defa...
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search 
   Bar = http://us.rd.yahoo.com/customize/ie/defaults/sb/...
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search 
   Page = http://us.rd.yahoo.com/customize/ie/defaults/sp...
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start 
   Page = http://www.yahoo.com/
R1 - HKCU\Software\Microsoft\Internet Explorer\SearchURL,
   (Default) = http://us.rd.yahoo.com/customize/ie/defaul...
R3 - URLSearchHook: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-...
O2 - BHO: &Yahoo! Toolbar Helper - {02478D38-C3F9-4EFB-9B...
O3 - Toolbar: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-892F-0...

As you can see Yahoo! Toolbar has add many configuration settings to your Windows system.