Ciao a tutti. Ecco il log di Hijackthis del PC di mia sorella.

Logfile of Trend Micro HijackThis v2.0.5
Scan saved at 21:58:45, on 16/07/2013
Platform: Windows 7 SP1 (WinNT 6.00.3505)
MSIE: Internet Explorer v9.00 (9.00.8112.16483)

FIREFOX: 22.0 (it)
Boot mode: Normal

Running processes:
F:\Program Files (x86)\CyberLink\YouCam\YCMMirage.exe
F:\Windows\SoftwareDistribution\Download\Install\NDP40-KB2835393-x64.exe
c:\69ca2490a617dca95c5c\Setup.exe
F:\Windows\syswow64\MsiExec.exe
F:\Program Files (x86)\Mozilla Firefox\firefox.exe
F:\Users\Maria\Downloads\HijackThis.exe
F:\Program Files (x86)\EaseUS\EaseUS Partition Master 9.2.2\bin\EpmNews.exe
F:\Program Files (x86)\EaseUS\EaseUS Partition Master 9.2.2\bin\EPMStartLoader.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://go.microsoft.com/fwlink/?LinkId=69157
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://go.microsoft.com/fwlink/?LinkId=69157
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://go.microsoft.com/fwlink/?LinkId=54896
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://go.microsoft.com/fwlink/?LinkId=69157
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page = F:\Windows\SysWOW64\blank.htm
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
F2 - REG:system.ini: UserInit=userinit.exe
O4 - HKLM\..\Run: [StartCCC] "F:\Program Files (x86)\ATI Technologies\ATI.ACE\Core-Static\CLIStart.exe" MSRun
O4 - HKLM\..\Run: [EaseUS EPM tray] F:\Program Files (x86)\EaseUS\EaseUS Partition Master 9.2.2\bin\EpmNews.exe
O4 - HKCU\..\Run: [Sidebar] F:\Program Files\Windows Sidebar\sidebar.exe /autoRun
O4 - HKUS\S-1-5-19\..\Run: [Sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /autoRun (User '?')
O4 - HKUS\S-1-5-19\..\RunOnce: [mctadmin] F:\Windows\System32\mctadmin.exe (User '?')
O4 - HKUS\S-1-5-20\..\Run: [Sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /autoRun (User '?')
O4 - HKUS\S-1-5-20\..\RunOnce: [mctadmin] F:\Windows\System32\mctadmin.exe (User '?')
O4 - HKUS\S-1-5-21-210887212-1236010467-3869924849-1000\..\Run: [Sidebar] F:\Program Files\Windows Sidebar\sidebar.exe /autoRun (User '?')
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://F:\PROGRA~2\MICROS~3\Office12\EXCEL.EXE/3000
O11 - Options group: [ACCELERATED_GRAPHICS] Accelerated graphics
O17 - HKLM\System\CCS\Services\Tcpip\..\{253A0E26-809F-483A-9DC1-7F3727C596F8}: NameServer = 192.168.1.1
O17 - HKLM\System\CS1\Services\Tcpip\..\{253A0E26-809F-483A-9DC1-7F3727C596F8}: NameServer = 192.168.1.1
O17 - HKLM\System\CS2\Services\Tcpip\..\{253A0E26-809F-483A-9DC1-7F3727C596F8}: NameServer = 192.168.1.1
O18 - Protocol: grooveLocalGWS - {88FED34C-F0CA-4636-A375-3CB6248B04CD} - F:\Program Files (x86)\Microsoft Office\Office12\GrooveSystemServices.dll
O23 - Service: Adobe Acrobat Update Service (AdobeARMservice) - Adobe Systems Incorporated - F:\Program Files (x86)\Common Files\Adobe\ARM\1.0\armsvc.exe
O23 - Service: Adobe Flash Player Update Service (AdobeFlashPlayerUpdateSvc) - Adobe Systems Incorporated - F:\Windows\SysWOW64\Macromed\Flash\FlashPlayerUpdateService.exe
O23 - Service: @%SystemRoot%\system32\Alg.exe,-112 (ALG) - Unknown owner - F:\Windows\System32\alg.exe (file missing)
O23 - Service: AMD External Events Utility - Unknown owner - F:\Windows\system32\atiesrxx.exe (file missing)
O23 - Service: AMD FUEL Service - Advanced Micro Devices, Inc. - F:\Program Files\ATI Technologies\ATI.ACE\Fuel\Fuel.Service.exe
O23 - Service: @%SystemRoot%\system32\efssvc.dll,-100 (EFS) - Unknown owner - F:\Windows\System32\lsass.exe (file missing)
O23 - Service: @%systemroot%\system32\fxsresm.dll,-118 (Fax) - Unknown owner - F:\Windows\system32\fxssvc.exe (file missing)
O23 - Service: Servizio Google Update (gupdate) (gupdate) - Google Inc. - F:\Program Files (x86)\Google\Update\GoogleUpdate.exe
O23 - Service: Servizio Google Update (gupdatem) (gupdatem) - Google Inc. - F:\Program Files (x86)\Google\Update\GoogleUpdate.exe
O23 - Service: HP Support Assistant Service - Hewlett-Packard Company - F:\Program Files (x86)\Hewlett-Packard\HP Support Framework\hpsa_service.exe
O23 - Service: HP Quick Synchronization Service (HPDrvMntSvc.exe) - Hewlett-Packard Company - F:\Program Files (x86)\Hewlett-Packard\Shared\HPDrvMntSvc.exe
O23 - Service: HP Software Framework Service (hpqwmiex) - Hewlett-Packard Company - F:\Program Files (x86)\Hewlett-Packard\Shared\hpqWmiEx.exe
O23 - Service: IconMan_R - Realsil Microelectronics Inc. - F:\Program Files (x86)\Realtek\Realtek PCIE Card Reader\RIconMan.exe
O23 - Service: @keyiso.dll,-100 (KeyIso) - Unknown owner - F:\Windows\system32\lsass.exe (file missing)
O23 - Service: LightScribeService Direct Disc Labeling Service (LightScribeService) - Hewlett-Packard Company - F:\Program Files (x86)\Common Files\LightScribe\LSSrvc.exe
O23 - Service: Mozilla Maintenance Service (MozillaMaintenance) - Mozilla Foundation - F:\Program Files (x86)\Mozilla Maintenance Service\maintenanceservice.exe
O23 - Service: @comres.dll,-2797 (MSDTC) - Unknown owner - F:\Windows\System32\msdtc.exe (file missing)
O23 - Service: @%SystemRoot%\System32\netlogon.dll,-102 (Netlogon) - Unknown owner - F:\Windows\system32\lsass.exe (file missing)
O23 - Service: @%systemroot%\system32\psbase.dll,-300 (ProtectedStorage) - Unknown owner - F:\Windows\system32\lsass.exe (file missing)
O23 - Service: @%systemroot%\system32\Locator.exe,-2 (RpcLocator) - Unknown owner - F:\Windows\system32\locator.exe (file missing)
O23 - Service: @%SystemRoot%\system32\samsrv.dll,-1 (SamSs) - Unknown owner - F:\Windows\system32\lsass.exe (file missing)
O23 - Service: @%SystemRoot%\system32\snmptrap.exe,-3 (SNMPTRAP) - Unknown owner - F:\Windows\System32\snmptrap.exe (file missing)
O23 - Service: @%systemroot%\system32\spoolsv.exe,-1 (Spooler) - Unknown owner - F:\Windows\System32\spoolsv.exe (file missing)
O23 - Service: @%SystemRoot%\system32\sppsvc.exe,-101 (sppsvc) - Unknown owner - F:\Windows\system32\sppsvc.exe (file missing)
O23 - Service: @%SystemRoot%\system32\ui0detect.exe,-101 (UI0Detect) - Unknown owner - F:\Windows\system32\UI0Detect.exe (file missing)
O23 - Service: @%SystemRoot%\system32\vaultsvc.dll,-1003 (VaultSvc) - Unknown owner - F:\Windows\system32\lsass.exe (file missing)
O23 - Service: @%SystemRoot%\system32\vds.exe,-100 (vds) - Unknown owner - F:\Windows\System32\vds.exe (file missing)
O23 - Service: @%systemroot%\system32\vssvc.exe,-102 (VSS) - Unknown owner - F:\Windows\system32\vssvc.exe (file missing)
O23 - Service: @%SystemRoot%\system32\Wat\WatUX.exe,-601 (WatAdminSvc) - Unknown owner - F:\Windows\system32\Wat\WatAdminSvc.exe (file missing)
O23 - Service: @%systemroot%\system32\wbengine.exe,-104 (wbengine) - Unknown owner - F:\Windows\system32\wbengine.exe (file missing)
O23 - Service: @%Systemroot%\system32\wbem\wmiapsrv.exe,-110 (wmiApSrv) - Unknown owner - F:\Windows\system32\wbem\WmiApSrv.exe (file missing)
O23 - Service: @%PROGRAMFILES%\Windows Media Player\wmpnetwk.exe,-101 (WMPNetworkSvc) - Unknown owner - F:\Program Files (x86)\Windows Media Player\wmpnetwk.exe (file missing)

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End of file - 7578 bytes

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Ci sono malware?

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Devo aspettare ancora molto per controllare il LOG?

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Ho visto che hai evidenziato la parola "po'"
Provo con ADWCleaner. Ti faccio sapere se il PC va meglio.

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A 90° ci cuoci le uova, attento che bruci tutto, sarà sicuramente un portatile, dovresti aspirare dalla varie fessure con una bocchetta dell'aspirapolvere, mettici un sostegno dotato di ventola, riesce ad abbasare un po' la temperatura.

Guide non ne ho trovate.

Fai come ti ho suggerito, aspira dalle fessure oppure soffia con una bomboletta di aria compressa e poi metti un sostegno con una ventola vedrai che la temperatura migliora.
I portatili non bisogna mai lasciarli accesi continuamente nemmeno in Standby, specialmente in estate, meglio spegnerlo e riaccenderlo quando occorre.