Check the boxes next to all these items. Then close all windows except
HijackThis. Tell HijackThis to 'Fix checked'.

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.microsoft.com/isapi/redir.dll?p...B_PVER}&ar=home
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://www.microsoft.com/isapi/redi...=ie&ar=iesearch
R1 - HKCU\Software\Microsoft\Internet Explorer\Search,SearchAssistant = http://ie.search.msn.com/{SUB_RFC1766}/srchasst/srchasst.htm
R1 - HKCU\Software\Microsoft\Internet Explorer\Search,CustomizeSearch = http://ie.search.msn.com/{SUB_RFC1766}/srchasst/srchcust.htm
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.microsoft.com/isapi/redir.dll?p...B_PVER}&ar=home
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://www.microsoft.com/isapi/redi...er=6&ar=msnhome
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://www.microsoft.com/isapi/redi...=ie&ar=iesearch
R1 - HKCU\Software\Microsoft\Internet Explorer\SearchURL,(Default) = http://www.google.com/keyword/%s


reboot.....rescan....post new log....


Then have a look at this....follow thru on recommendations.
Stop hijacking before it happens.