quando clicco su un punto vuoto del desktop non appare nemmeno la barra per le opzioni della visualizzazione delle icone...
Ecco il log di hijackthis

Logfile of HijackThis v1.99.1
Scan saved at 18.52.21, on 04/06/2007
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)

Running processes:
C:\WINDOWS\System32\smss.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:\WINDOWS\system32\spoolsv.exe
C:\Programmi\Grisoft\AVG Anti-Spyware 7.5\guard.exe
C:\Programmi\Comodo\Firewall\cmdagent.exe
C:\WINDOWS\System32\CTsvcCDA.EXE
C:\Programmi\Panda Software\Panda Antivirus 2007\pavsrv51.exe
C:\Programmi\Panda Software\Panda Antivirus 2007\AVENGINE.EXE
C:\Programmi\Panda Software\Panda Antivirus 2007\PsImSvc.exe
C:\Programmi\Analog Devices\SoundMAX\SMAgent.exe
C:\WINDOWS\System32\svchost.exe
C:\Programmi\Panda Software\Panda Antivirus 2007\apvxdwin.exe
C:\WINDOWS\SYSTEM32\taskmgr.exe
c:\programmi\panda software\panda antivirus 2007\WebProxy.exe
C:\Programmi\MSN Messenger\msnmsgr.exe
C:\Programmi\MSN Messenger\usnsvc.exe
C:\Programmi\Mozilla Firefox\firefox.exe
C:\WINDOWS\regedit.exe
C:\transito\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://home.netscape.com/home/winsearch.html
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://home.netscape.com
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://home.netscape.com
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://home.netscape.com/home/winsearch.html
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = http://home.netscape.com/home/winsearch200.html
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://home.netscape.com/home/winsearch.html
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://home.netscape.com
R1 - HKCU\Software\Microsoft\Internet Explorer\SearchURL,(Default) = http://keyword.netscape.com/keyword/%s
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
N1 - Netscape 4: user_pref("browser.startup.homepage", "http://www.google.it"); (C:\Programmi\Netscape\Users\default\prefs.js)
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmi\Adobe\Acrobat 5.0\Reader\ActiveX\AcroIEHelper.ocx
O2 - BHO: (no name) - {7E853D72-626A-48EC-A868-BA8D5E23E045} - (no file)
O2 - BHO: Windows Live Sign-in Helper - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Programmi\File comuni\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O4 - HKLM\..\Run: [VTTimer] VTTimer.exe
O4 - HKLM\..\Run: [NeroCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [CARPService] carpserv.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] C:\Programmi\Java\jre1.5.0_04\bin\jusched.exe
O4 - HKLM\..\Run: [UnlockerAssistant] "C:\transito\unlocker\UnlockerAssistant.exe"
O4 - HKLM\..\Run: [APVXDWIN] "C:\Programmi\Panda Software\Panda Antivirus 2007\APVXDWIN.EXE" /s
O4 - HKLM\..\Run: [COMODO Firewall Pro] "C:\Programmi\Comodo\Firewall\CPF.exe" /background
O4 - Global Startup: Microsoft Office.lnk = C:\Programmi\Microsoft Office\Office\OSA9.EXE
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Programmi\Java\jre1.5.0_04\bin\npjpi150_04.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Programmi\Java\jre1.5.0_04\bin\npjpi150_04.dll
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Programmi\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Programmi\Messenger\msmsgs.exe
O16 - DPF: {6E32070A-766D-4EE6-879C-DC1FA91D2FC3} (MUWebControl Class) - http://update.microsoft.com/microsof...?1171049961968
O17 - HKLM\System\CCS\Services\Tcpip\..\{93349AEE-7939-4C15-A089-3EF51114DB82}: NameServer = 85.37.17.41 85.38.28.83
O18 - Protocol: livecall - {828030A1-22C1-4009-854F-8E305202313F} - C:\PROGRA~1\MSNMES~1\MSGRAP~1.DLL
O18 - Protocol: msnim - {828030A1-22C1-4009-854F-8E305202313F} - C:\PROGRA~1\MSNMES~1\MSGRAP~1.DLL
O20 - Winlogon Notify: WgaLogon - C:\WINDOWS\SYSTEM32\WgaLogon.dll
O23 - Service: AVG Anti-Spyware Guard - Anti-Malware Development a.s. - C:\Programmi\Grisoft\AVG Anti-Spyware 7.5\guard.exe
O23 - Service: Comodo Application Agent (CmdAgent) - COMODO - C:\Programmi\Comodo\Firewall\cmdagent.exe
O23 - Service: Creative Service for CDROM Access - Creative Technology Ltd - C:\WINDOWS\System32\CTsvcCDA.EXE
O23 - Service: Panda anti-virus service (PAVSRV) - Panda Software International - C:\Programmi\Panda Software\Panda Antivirus 2007\pavsrv51.exe
O23 - Service: Panda IManager Service (PSIMSVC) - Panda Software - C:\Programmi\Panda Software\Panda Antivirus 2007\PsImSvc.exe
O23 - Service: SoundMAX Agent Service (SoundMAX Agent Service (default)) - Analog Devices, Inc. - C:\Programmi\Analog Devices\SoundMAX\SMAgent.exe

Inoltre cercando un po' tra i topic successivi ne ho trovati vari riguardanti problemi simili, ma guardando nel registro non mi pare di avere nessuna delle chiavi sintomo di Linkoptimizer B...
Grazie,
GianPaolo