Close all (browser) windows & rescan with hijackthis. When the scan is finished place a check in the box to the left of the following entries & click 'fix checked' :
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,SearchURL = about:blank
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,SearchURL = about:blank
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://red.clientapps.yahoo.com/cus...://my.yahoo.com
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
R1 - HKCU\Software\Microsoft\Internet Explorer\SearchURL,(Default) = http://red.clientapps.yahoo.com/cus...//www.yahoo.com
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page_bak = about:blank
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page_bak = about:blank
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Koblinger
bridge is added by a trojan. Plz post another log after a reboot, I want to see if those about:blank entries return.