Move C:\WINDOWS\DESKTOP\HIJACKTHIS[1].EXE to its own permanent directory.
Boot in Safe Mode.
Get rid of this pest, C:\WINDOWS\SYSTEM\LOCATORS.DLL following these instructions:
http://www3.ca.com/securityadvisor/pest/pest.aspx?id=453076978
Run HJT on its own and let it 'fix':
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page =
http://start.earthlink.net/
R1 - HKLM\Software\Microsoft\Internet Explorer\Search,(Default) =
http://ls0.net/srchasst.html (obfuscated)
O6 - HKCU\Software\Policies\Microsoft\Internet Explorer\Control Panel present
O6 - HKLM\Software\Policies\Microsoft\Internet Explorer\Control Panel present
O9 - Extra button: Locators.com Search Bar - {A26ABCF0-1C8F-46e7-A67C-0489DC21B9CC} - C:\WINDOWS\SYSTEM\LOCATORS.DLL
O9 - Extra 'Tools' menuitem: Locators.com Search Bar - {A26ABCF0-1C8F-46e7-A67C-0489DC21B9CC} - C:\WINDOWS\SYSTEM\LOCATORS.DLL
O16 - DPF: {74D05D43-3236-11D4-BDCD-00C04F9A3B61} (HouseCall Control) -
http://a840.g.akamai.net/7/840/537/2004061001/housecall.trendmicro.com/housecall/xscan53.cab
O19 - User stylesheet: (file missing)
When done, delete C:\WINDOWS\SYSTEM\LOCATORS.DLL