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=

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = http://red.clientapps.yahoo.com/cus...rch/search.html
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://red.clientapps.yahoo.com/cus...://my.yahoo.com
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = http://red.clientapps.yahoo.com/cus...rch/search.html
R1 - HKCU\Software\Microsoft\Internet Explorer\SearchURL,(Default) = http://red.clientapps.yahoo.com/cus...//www.yahoo.com

O4 - HKLM\..\Run: [RunDLL] rundll32.exe "C:\WINDOWS\System32\bridge.dll",Load

Uninstall messenger plus then reinstall it manually without installing the 3rd party sponsor, which comes from Lop & will give problems.