Utilizo el HijackThis, hago Fix Checked de los R0 y R1 y ellos vueven.
Este es mi log

Logfile of HijackThis v1.99.1
Scan saved at 1:33:12 PM, on 5/15/2005
Platform: Windows XP (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP1 (6.00.2600.0000)

Running processes:
C:\WINDOWS\System32\smss.exe
C:\WINDOWS\system32\csrss.exe
C:\WINDOWS\system32\winlogon.exe
C:\WINDOWS\system32\services.exe
C:\WINDOWS\system32\lsass.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\AntiVirus\Sygate\SPF\smc.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\Explorer.EXE
C:\Program Files\AntiVirus\Microsoft AntiSpyware\gcasServ.exe
C:\WINDOWS\System32\ctfmon.exe
C:\Program Files\Messenger\msmsgs.exe
C:\Program Files\Babylon\Babylon.exe
C:\Program Files\Siber Systems\AI RoboForm\RoboTaskBarIcon.exe
C:\Program Files\Yahoo!\Messenger\ypager.exe
C:\Program Files\Webroot\Spy Sweeper\SpySweeper.exe
C:\Program Files\eMule\emule.exe
C:\Program Files\MSI\Core Center\CoreCenter.exe
C:\Program Files\MSI\DigiCell\DigiCell.exe
C:\Program Files\VIA\RAID\raid_tool.exe
C:\Program Files\AntiVirus\Microsoft AntiSpyware\gcasDtServ.exe
C:\Program Files\Common Files\Microsoft Shared\VS7Debug\mdm.exe
C:\WINDOWS\System32\wbem\wmiprvse.exe
C:\Program Files\AntiVirus\Ad-Aware SE Personal\Ad-Aware.exe
C:\Program Files\Totalcmd\TOTALCMD.EXE
C:\WINDOWS\System32\wuauclt.exe
C:\DOCUME~1\Leo\LOCALS~1\Temp\_tc\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = http://searchforfree.info/browser/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://searchforfree.info/?sid=u001
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://searchforfree.info/browser/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://searchforfree.info/browser/
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://searchforfree.info/?sid=u001
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant = http://searchforfree.info/browser/
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch = http://searchforfree.info/browser/
O2 - BHO: Yahoo! Companion BHO - {02478D38-C3F9-4efb-9B51-7695ECA05670} - C:\PROGRA~1\Yahoo!\COMPAN~1\Installs\cpn\ycomp5_5_ 7_0.dll
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 5.0\Reader\ActiveX\AcroIEHelper.ocx
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\ANTIVI~1\SPYBOT~1\SDHelper.dll
O2 - BHO: (no name) - {724d43a9-0d85-11d4-9908-00400523e39a} - C:\Program Files\Siber Systems\AI RoboForm\RoboForm.dll
O3 - Toolbar: &RoboForm - {724d43a0-0d85-11d4-9908-00400523e39a} - C:\Program Files\Siber Systems\AI RoboForm\RoboForm.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx
O3 - Toolbar: &Yahoo! Companion - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\PROGRA~1\Yahoo!\COMPAN~1\Installs\cpn\ycomp5_5_ 7_0.dll
O4 - HKLM\..\Run: [SmcService] C:\PROGRA~1\ANTIVI~1\Sygate\SPF\smc.exe -startgui
O4 - HKLM\..\Run: [gcasServ] "C:\Program Files\AntiVirus\Microsoft AntiSpyware\gcasServ.exe"
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\ctfmon.exe
O4 - HKCU\..\Run: [MSMSGS] "C:\Program Files\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [Babylon Translator] C:\Program Files\Babylon\Babylon.exe
O4 - HKCU\..\Run: [RoboForm] "C:\Program Files\Siber Systems\AI RoboForm\RoboTaskBarIcon.exe"
O4 - HKCU\..\Run: [Yahoo! Pager] C:\Program Files\Yahoo!\Messenger\ypager.exe -quiet
O4 - HKCU\..\Run: [SpySweeper] "C:\Program Files\Webroot\Spy Sweeper\SpySweeper.exe" /0
O4 - HKCU\..\Run: [eMuleAutoStart] C:\Program Files\eMule\emule.exe -AutoStart
O4 - Global Startup: CoreCenter.lnk = C:\Program Files\MSI\Core Center\CoreCenter.exe
O4 - Global Startup: DigiCell.lnk = C:\Program Files\MSI\DigiCell\DigiCell.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Program Files\Microsoft Office\Office10\OSA.EXE
O4 - Global Startup: VIA RAID TOOL.lnk = C:\Program Files\VIA\RAID\raid_tool.exe
O8 - Extra context menu item: &Yahoo! Search - file:///C:\Program Files\Yahoo!\Common/ycsrch.htm
O8 - Extra context menu item: Customize Menu &4 - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComCustomizeIEMenu.html
O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office10\EXCEL.EXE/3000
O8 - Extra context menu item: Fill Forms &] - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComFillForms.html
O8 - Extra context menu item: Save Forms &[ - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComSavePass.html
O8 - Extra context menu item: Yahoo! &Dictionary - file:///C:\Program Files\Yahoo!\Common/ycdict.htm
O8 - Extra context menu item: Yahoo! &Maps - file:///C:\Program Files\Yahoo!\Common/ycmap.htm
O9 - Extra button: Fill Forms - {320AF880-6646-11D3-ABEE-C5DBF3571F46} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComFillForms.html
O9 - Extra 'Tools' menuitem: Fill Forms &] - {320AF880-6646-11D3-ABEE-C5DBF3571F46} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComFillForms.html
O9 - Extra button: Save - {320AF880-6646-11D3-ABEE-C5DBF3571F49} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComSavePass.html
O9 - Extra 'Tools' menuitem: Save Forms &[ - {320AF880-6646-11D3-ABEE-C5DBF3571F49} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComSavePass.html
O9 - Extra button: Messenger - {4528BBE0-4E08-11D5-AD55-00010333D0AD} - C:\Program Files\Yahoo!\Messenger\yhexbmes0521.dll
O9 - Extra 'Tools' menuitem: Yahoo! Messenger - {4528BBE0-4E08-11D5-AD55-00010333D0AD} - C:\Program Files\Yahoo!\Messenger\yhexbmes0521.dll
O9 - Extra button: RoboForm - {724d43aa-0d85-11d4-9908-00400523e39a} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComShowToolbar.html
O9 - Extra 'Tools' menuitem: RF Toolbar &2 - {724d43aa-0d85-11d4-9908-00400523e39a} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComShowToolbar.html
O12 - Plugin for .spop: C:\Program Files\Internet Explorer\Plugins\NPDocBox.dll
O16 - DPF: {17492023-C23A-453E-A040-C7C580BBF700} (Windows Genuine Advantage Validation Tool) - http://go.microsoft.com/fwlink/?linkid=36467&clcid=0x409
O16 - DPF: {74D05D43-3236-11D4-BDCD-00C04F9A3B61} (HouseCall Control) - http://a840.g.akamai.net/7/840/537/2004061001/housecall.trendmicro.com/housecall/xscan53.cab
O18 - Protocol: ms-help - {314111C7-A502-11D2-BBCA-00C04F8EC294} - C:\Program Files\Common Files\Microsoft Shared\Help\hxds.dll
O23 - Service: Sygate Personal Firewall (SmcService) - Sygate Technologies, Inc. - C:\Program Files\AntiVirus\Sygate\SPF\smc.exe

Hola, te doy la bienvenida al Foro de Spyware, para eliminar el searchforfree.info tenemos un articulo con los pasos a seguir y aparte del HijackThis tenes que usar el KillBox.

http://www.forospyware.com/t1472-.html

Después nos contas los resultados en este mismo mensaje.

Salu2