Ho fatto una scansione del pc in questione con i suddetti programmi: Malwarebytes,Avira AntiVir Personal,HijackThis v2.0.2.

L'infezione risale al 15 dic 2011. Il pc monta come s.o. vista 32 bit. L'infezione secondo il racconto di mio fratello è avvenuta durante la navigazione su facebook.
Le scansioni sono state in modalità provvisoria senza rete,con il wifi chiuso ecc.
A quanto pare malwarebytes ha bloccato la minaccia. Il problema che sono scomparsi tutti i collegamenti a file o programmi sul desktop,nella barra di avvio veloce e dentro le cartelle che stavano in C:/... documenti .

Però se clicco col tasto destro del mouse sopra la cartella,essa risulta pesare più di 10 MB dipende da quanti file c'erano prima dell'infezione (per capirci: secondo il peso in Megabyte la cartella dovrebbe essere piena ma i file realmente io nn li vedo)

allega i log della scansione e aspetto vostre indicazioni su come poter "riavere" i miei file.

ps. io avevo pensato a programmi di recupero file però magari è solo un problema di registro

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 21.33.51, on 15/12/2011
Platform: Windows Vista (WinNT 6.00.1904)
MSIE: Internet Explorer v7.00 (7.00.6000.16386)
Boot mode: Normal

Running processes:
C:\Windows\system32\Dwm.exe
C:\Windows\Explorer.EXE
C:\Windows\system32\taskeng.exe
C:\Program Files\ASUS\ASUS Live Update\ALU.exe
C:\Windows\system32\taskeng.exe
C:\Windows\RtHDVCpl.exe
C:\Program Files\Intel\Intel Matrix Storage Manager\IAANOTIF.EXE
C:\Program Files\Motorola\SMSERIAL\sm56hlpr.exe
C:\Program Files\Synaptics\SynTP\SynTPEnh.exe
C:\Program Files\ASUS\ATK Media\DMedia.exe
C:\Program Files\P4P\P4P.exe
C:\Program Files\Avira\AntiVir Desktop\avgnt.exe
C:\Program Files\Malwarebytes' Anti-Malware\mbamgui.exe
C:\Program Files\Windows Defender\MSASCui.exe
C:\Windows\System32\mobsync.exe
C:\Program Files\Trend Micro\HijackThis\HijackThis.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://www.asus.com
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://www.asus.com
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 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
O1 - Hosts: ::1 localhost
O2 - BHO: AcroIEHelperStub - {18DF081C-E8AD-4283-A596-FA578C2EBDC3} - C:\Program Files\Common Files\Adobe\Acrobat\ActiveX\AcroIEHelperShim.dll
O2 - BHO: Java(tm) Plug-In SSV Helper - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre6\bin\ssv.dll
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Program Files\Java\jre6\bin\jp2ssv.dll
O4 - HKLM\..\Run: [StartCCC] C:\Program Files\ATI Technologies\ATI.ACE\Core-Static\CLIStart.exe
O4 - HKLM\..\Run: [RtHDVCpl] RtHDVCpl.exe
O4 - HKLM\..\Run: [IAAnotif] "C:\Program Files\Intel\Intel Matrix Storage Manager\Iaanotif.exe"
O4 - HKLM\..\Run: [SMSERIAL] C:\Program Files\Motorola\SMSERIAL\sm56hlpr.exe
O4 - HKLM\..\Run: [JMB36X IDE Setup] C:\Windows\RaidTool\xInsIDE.exe
O4 - HKLM\..\Run: [SynTPEnh] C:\Program Files\Synaptics\SynTP\SynTPEnh.exe
O4 - HKLM\..\Run: [ATKMEDIA] C:\Program Files\ASUS\ATK Media\DMEDIA.EXE
O4 - HKLM\..\Run: [PowerForPhone] "C:\Program Files\P4P\P4P.exe"
O4 - HKLM\..\Run: [Adobe ARM] "C:\Program Files\Common Files\Adobe\ARM\1.0\AdobeARM.exe"
O4 - HKLM\..\Run: [Malwarebytes' Anti-Malware (reboot)] "C:\Program Files\Malwarebytes' Anti-Malware\mbam.exe" /runcleanupscript
O4 - HKLM\..\Run: [Malwarebytes' Anti-Malware] "C:\Program Files\Malwarebytes' Anti-Malware\mbamgui.exe" /starttray
O4 - HKUS\S-1-5-19\..\Run: [Sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /detectMem (User 'SERVIZIO LOCALE')
O4 - HKUS\S-1-5-19\..\Run: [WindowsWelcomeCenter] rundll32.exe oobefldr.dll,ShowWelcomeCenter (User 'SERVIZIO LOCALE')
O4 - HKUS\S-1-5-20\..\Run: [Sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /detectMem (User 'SERVIZIO DI RETE')
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office12\EXCEL.EXE/3000
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\Office12\REFIEBAR.DLL
O13 - Gopher Prefix:
O18 - Protocol: linkscanner - {F274614C-63F8-47D5-A4D1-FBDDE494F8D1} - (no file)
O23 - Service: Adobe Acrobat Update Service (AdobeARMservice) - Adobe Systems Incorporated - C:\Program Files\Common Files\Adobe\ARM\1.0\armsvc.exe
O23 - Service: ADSM Service (ADSMService) - Unknown owner - C:\Program Files\ASUS\ASUS Data Security Manager\ADSMSrv.exe
O23 - Service: Avira AntiVir Scheduler (AntiVirScheduler) - Avira GmbH - C:\Program Files\Avira\AntiVir Desktop\sched.exe
O23 - Service: Avira AntiVir Guard (AntiVirService) - Avira GmbH - C:\Program Files\Avira\AntiVir Desktop\avguard.exe
O23 - Service: ASLDR Service (ASLDRService) - Unknown owner - C:\Program Files\ATK Hotkey\ASLDRSrv.exe
O23 - Service: Ati External Event Utility - ATI Technologies Inc. - C:\Windows\system32\Ati2evxx.exe
O23 - Service: ATKGFNEX Service (ATKGFNEXSrv) - Unknown owner - C:\Program Files\ATKGFNEX\GFNEXSrv.exe
O23 - Service: Intel(R) PROSet/Wireless Event Log (EvtEng) - Intel Corporation - C:\Program Files\Intel\Wireless\Bin\EvtEng.exe
O23 - Service: Intel(R) Matrix Storage Event Monitor (IAANTMON) - Intel Corporation - C:\Program Files\Intel\Intel Matrix Storage Manager\IAANTMon.exe
O23 - Service: MBAMService - Malwarebytes Corporation - C:\Program Files\Malwarebytes' Anti-Malware\mbamservice.exe
O23 - Service: Intel(R) PROSet/Wireless Registry Service (RegSrvc) - Intel Corporation - C:\Program Files\Intel\Wireless\Bin\RegSrvc.exe
O23 - Service: spmgr - Unknown owner - C:\Program Files\ASUS\NB Probe\SPM\spmgr.exe
O23 - Service: TP - Unknown owner - C:\Users\marco\AppData\Local\Temp\TP.exe (file missing)

--
End of file - 5354 bytes
Malwarebytes' Anti-Malware 1.51.2.1300
www.malwarebytes.org

Database version: 7622

Windows 6.0.6000 (Safe Mode)
Internet Explorer 7.0.6000.16386

15/12/2011 21.11.30
mbam-log-2011-12-15 (21-11-24).txt

Scan type: Full scan (C:\|D:\|)
Objects scanned: 209587
Time elapsed: 18 minute(s), 26 second(s)

Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 0
Registry Data Items Infected: 2
Folders Infected: 0
Files Infected: 1

Memory Processes Infected:
(No malicious items detected)

Memory Modules Infected:
(No malicious items detected)

Registry Keys Infected:
(No malicious items detected)

Registry Values Infected:
(No malicious items detected)

Registry Data Items Infected:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\Curre ntVersion\Explorer\Advanced\Start_ShowMyComputer (PUM.Hijack.StartMenu) -> Bad: (0) Good: (1) -> No action taken.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\Curre ntVersion\Explorer\Advanced\Start_ShowSearch (PUM.Hijack.StartMenu) -> Bad: (0) Good: (1) -> No action taken.

Folders Infected:
(No malicious items detected)

Files Infected:
c:\Users\marco\AppData\Local\Temp\wuauclt.exe (Trojan.Agent) -> No action taken.