here is a log of hijackthis in a moment of dpcs
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:\WINDOWS\system32\spoolsv.exe
C:\Arquivos de programas\Kaspersky Lab\Kaspersky Anti-Virus 7.0\avp.exe
C:\WINDOWS\Explorer.EXE
C:\Arquivos de programas\Kaspersky Lab\Kaspersky Anti-Virus 7.0\avp.exe
C:\WINDOWS\RTHDCPL.EXE
C:\Arquivos de programas\Windows Live\Messenger\msnmsgr.exe
C:\WINDOWS\system32\ctfmon.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\mmc.exe
C:\WINDOWS\system32\DfrgNtfs.exe
C:\Arquivos de programas\Ubisoft\Assassin's Creed\AssassinsCreed_Dx9.exe
C:\Documents and Settings\Leonardo\Desktop\HijackThis.exe
C:\DOCUMENTS AND SETTINGS\LEONARDO\DESKTOP\PROCEXP.EXE
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = &
http://home.microsof...ss/allinone.asp
O2 - BHO: CompSegIB - {2E3C3651-B19C-4DD9-A979-901EC3E930AF} - C:\Arquivos de programas\Scpad\scpsssh2.dll
O2 - BHO: Megaupload Toolbar - {4E7BD74F-2B8D-469E-CCB0-B130EEDBE97C} - C:\ARQUIV~1\MEGAUP~1\MEGAUP~1.DLL
O2 - BHO: (no name) - {7E853D72-626A-48EC-A868-BA8D5E23E045} - (no file)
O3 - Toolbar: Megaupload Toolbar - {4E7BD74F-2B8D-469E-CCB0-B130EEDBE97C} - C:\ARQUIV~1\MEGAUP~1\MEGAUP~1.DLL
O4 - HKLM\..\Run: [AVP] "C:\Arquivos de programas\Kaspersky Lab\Kaspersky Anti-Virus 7.0\avp.exe"
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [RTHDCPL] RTHDCPL.EXE
O4 - HKLM\..\Run: [Alcmtr] ALCMTR.EXE
O4 - HKLM\..\Run: [amd_dc_opt] C:\Arquivos de programas\AMD\Dual-Core Optimizer\amd_dc_opt.exe
O4 - HKCU\..\Run: [msnmsgr] "C:\Arquivos de programas\Windows Live\Messenger\msnmsgr.exe" /background
O4 - HKCU\..\Run: [DLD.EXE] C:\Arquivos de programas\Download Direct\DLD.exe
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - Startup: Registration Assassin's Creed.LNK = C:\Arquivos de programas\Ubisoft\Assassin's Creed\Register\RegistrationReminder.exe
O4 - Global Startup: RATT.lnk = C:\Arquivos de programas\Microsoft\RATTV3\RATT.exe
O8 - Extra context menu item: E&xportar para o Microsoft Excel - res://C:\ARQUIV~1\MICROS~2\Office12\EXCEL.EXE/3000
O9 - Extra button: Web Anti-Virus statistics - {1F460357-8A94-4D71-9CA3-AA4ACF32ED8E} - C:\Arquivos de programas\Kaspersky Lab\Kaspersky Anti-Virus 7.0\SCIEPlgn.dll
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\ARQUIV~1\MICROS~2\Office12\REFIEBAR.DLL
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - %windir%\Network Diagnostic\xpnetdiag.exe (file missing)
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - %windir%\Network Diagnostic\xpnetdiag.exe (file missing)
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Arquivos de programas\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Arquivos de programas\Messenger\msmsgs.exe
O14 - IERESET.INF: SEARCH_PAGE_URL=&
http://home.microsof...ss/allinone.asp
O16 - DPF: {0E5F0222-96B9-11D3-8997-00104BD12D94} (PCPitstop Utility) -
http://www.pcpitstop...p/PCPitStop.CAB
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) -
http://www.update.mi...b?1210567639546
O16 - DPF: {6E32070A-766D-4EE6-879C-DC1FA91D2FC3} (MUWebControl Class) -
http://www.update.mi...b?1210619291125
O16 - DPF: {E8F628B5-259A-4734-97EE-BA914D7BE941} (Driver Agent ActiveX Control) -
http://plugin.driver...driveragent.cab
O18 - Protocol: livecall - {828030A1-22C1-4009-854F-8E305202313F} - C:\ARQUIV~1\WINDOW~4\MESSEN~1\MSGRAP~1.DLL
O18 - Protocol: ms-help - {314111C7-A502-11D2-BBCA-00C04F8EC294} - C:\Arquivos de programas\Arquivos comuns\Microsoft Shared\Help\hxds.dll
O18 - Protocol: msnim - {828030A1-22C1-4009-854F-8E305202313F} - C:\ARQUIV~1\WINDOW~4\MESSEN~1\MSGRAP~1.DLL
O18 - Filter hijack: text/xml - {807563E5-5146-11D5-A672-00B0D022E945} - C:\ARQUIV~1\ARQUIV~1\MICROS~1\OFFICE12\MSOXMLMF.DLL
O20 - Winlogon Notify: dimsntfy - %SystemRoot%\System32\dimsntfy.dll (file missing)
O20 - Winlogon Notify: klogon - C:\WINDOWS\system32\klogon.dll
O21 - SSODL: CompIBBrd - {A3717295-941D-416F-9384-ED1736729F1C} - C:\Arquivos de programas\Scpad\scpLIB.dll
O23 - Service: Kaspersky Anti-Virus 7.0 (AVP) - Unknown owner - C:\Arquivos de programas\Kaspersky Lab\Kaspersky Anti-Virus 7.0\avp.exe" -r (file missing)