After you remove these entries, upgrade to IE8 and see if the problem still persists
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = MSN.com
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = Yahoo! SearchBar Home Page
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = Yahoo!
Uninstall Yahoo Toolbar and then remove these entries if not already removed
O2 - BHO: &Yahoo! Toolbar Helper - {02478D38-C3F9-4efb-9B51-7695ECA05670} - C:\PROGRA~1\Yahoo!\Companion\Installs\cpn1\yt.dll
O2 - BHO: Yahoo! IE Services Button - {5BAB4B5B-68BC-4B02-94D6-2FC0DE4A7897} - C:\Program Files\Yahoo!\Common\yiesrvc.dll
O3 - Toolbar: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\PROGRA~1\Yahoo!\Companion\Installs\cpn1\yt.dll
O9 - Extra button: Yahoo! Services - {5BAB4B5B-68BC-4B02-94D6-2FC0DE4A7897} - C:\Program Files\Yahoo!\Common\yiesrvc.dll
Remove these Java entries and then reinstall the newest Java version
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - c:\Program Files\Java\jre1.6.0\bin\npjpi160.dll
Uninstall Viewpoint and then remove this entry
O23 - Service: Viewpoint Manager Service - Viewpoint Corporation - C:\Program Files\Viewpoint\Common\ViewpointService.exe
Java Update
java.com: Java + You
IE 8 Update
Internet Explorer 8: Home page
Update to AVG 9
AVG Free - Download installation files & documentation
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = MSN.com
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = Yahoo! SearchBar Home Page
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = Yahoo!
Uninstall Yahoo Toolbar and then remove these entries if not already removed
O2 - BHO: &Yahoo! Toolbar Helper - {02478D38-C3F9-4efb-9B51-7695ECA05670} - C:\PROGRA~1\Yahoo!\Companion\Installs\cpn1\yt.dll
O2 - BHO: Yahoo! IE Services Button - {5BAB4B5B-68BC-4B02-94D6-2FC0DE4A7897} - C:\Program Files\Yahoo!\Common\yiesrvc.dll
O3 - Toolbar: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\PROGRA~1\Yahoo!\Companion\Installs\cpn1\yt.dll
O9 - Extra button: Yahoo! Services - {5BAB4B5B-68BC-4B02-94D6-2FC0DE4A7897} - C:\Program Files\Yahoo!\Common\yiesrvc.dll
Remove these Java entries and then reinstall the newest Java version
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - c:\Program Files\Java\jre1.6.0\bin\npjpi160.dll
Uninstall Viewpoint and then remove this entry
O23 - Service: Viewpoint Manager Service - Viewpoint Corporation - C:\Program Files\Viewpoint\Common\ViewpointService.exe
Java Update
java.com: Java + You
IE 8 Update
Internet Explorer 8: Home page
Update to AVG 9
AVG Free - Download installation files & documentation