Hallo,
Also hier das Logfile vom Rechner meines Bruders. Ich meine die einzige Chance ist, den Rechner platt zu machen und dann neu aufsetzen. Bitte nur mal anschauen und eure Meinung dazu.

Vielen Dank

Logfile of HijackThis v1.99.1
Scan saved at 00:27:13, on 01.01.1999
Platform: Windows XP (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 (6.00.2600.0000)

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:\Programme\Sygate\SPF\smc.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Programme\AVPersonal\AVGUARD.EXE
C:\Programme\AVPersonal\AVWUPSRV.EXE
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\System\MSMSGSVC.exe
C:\Programme\CleanMyPC\Registry Cleaner\RCScheduler.exe
C:\Programme\Messenger\msmsgs.exe
C:\WINDOWS\system32\ZoneLabs\vsmon.exe
C:\Dokumente und Einstellungen\andreas\Lokale Einstellungen\Temp\Temporäres Verzeichnis 6 für hijackthis.zip\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://www.e-finder.cc/search/ (obfuscated)
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = http://www.e-finder.cc/search/ (obfuscated)
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://www.e-finder.cc/search/ (obfuscated)
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://default.home
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://www.e-finder.cc/search/ (obfuscated)
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = http://www.e-finder.cc/search/ (obfuscated)
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://www.e-finder.cc/search/ (obfuscated)
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://default.home
R1 - HKCU\Software\Microsoft\Internet Explorer\Search,SearchAssistant = http://www.e-finder.cc/search/ (obfuscated)
R1 - HKCU\Software\Microsoft\Internet Explorer\Search,CustomizeSearch = http://www.e-finder.cc/search/ (obfuscated)
R1 - HKCU\Software\Microsoft\Internet Explorer\Search,(Default) = http://www.e-finder.cc/search/ (obfuscated)
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant = http://www.e-finder.cc/search/ (obfuscated)
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch = http://www.e-finder.cc/search/ (obfuscated)
R1 - HKLM\Software\Microsoft\Internet Explorer\Search,(Default) = http://www.e-finder.cc/search/ (obfuscated)
R1 - HKCU\Software\Microsoft\Internet Explorer\SearchURL,(Default) = http://www.e-finder.cc/search/ (obfuscated)
R1 - HKLM\Software\Microsoft\Internet Explorer\SearchURL,(Default) = http://www.e-finder.cc/search/ (obfuscated)
O2 - BHO: DOMPeek Class - {834261E1-DD97-4177-853B-C907E5D5BD6E} - C:\WINDOWS\dpe.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\programme\google\googletoolbar2.dll
O3 - Toolbar: Yahoo! Companion - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\Programme\Yahoo!\Companion\Installs\cpn\ycomp5_3_19_0.dll
O4 - HKLM\..\Run: [Zone Labs Client] C:\PROGRA~1\ZONELA~1\ZONEAL~1\zlclient.exe
O4 - HKLM\..\Run: [SmcService] C:\PROGRA~1\Sygate\SPF\smc.exe -startgui
O4 - HKLM\..\Run: [KernelFaultCheck] %systemroot%\system32\dumprep 0 -k
O4 - HKCU\..\Run: [YAW starten] "D:\YAW 3.5\yawguard.exe"
O4 - HKCU\..\Run: [MSMsgSvc] C:\WINDOWS\System\MSMSGSVC.exe
O4 - HKCU\..\Run: [Registry Cleaner Scheduler] "C:\Programme\CleanMyPC\Registry Cleaner\RCScheduler.exe" /startup
O4 - HKCU\..\Run: [MSMSGS] "C:\Programme\Messenger\msmsgs.exe" /background
O4 - Global Startup: Microsoft Office.lnk = C:\Programme\Microsoft Office\Office10\OSA.EXE
O8 - Extra context menu item: &Google Search - res://c:\programme\google\GoogleToolbar2.dll/cmsearch.html
O8 - Extra context menu item: Im Cache gespeicherte Seite - res://c:\programme\google\GoogleToolbar2.dll/cmcache.html
O8 - Extra context menu item: Nach Microsoft &Excel exportieren - res://C:\PROGRA~1\MICROS~2\Office10\EXCEL.EXE/3000
O8 - Extra context menu item: Verweisseiten - res://c:\programme\google\GoogleToolbar2.dll/cmbacklinks.html
O8 - Extra context menu item: Ähnliche Seiten - res://c:\programme\google\GoogleToolbar2.dll/cmsimilar.html
O9 - Extra button: iFinger - {936E5D60-596C-11D3-BB96-00600816DF55} - C:\WINDOWS\System32\SHDOCVW.DLL
O12 - Plugin for .mpeg: C:\Programme\Internet Explorer\PLUGINS\npqtplugin3.dll
O12 - Plugin for .mpg: C:\Programme\Internet Explorer\PLUGINS\npqtplugin3.dll
O13 - DefaultPrefix: http://ehttp.cc/?
O13 - WWW Prefix: http://ehttp.cc/?
O13 - WWW. Prefix: http://ehttp.cc/?
O16 - DPF: {D719897A-B07A-4C0C-AEA9-9B663A28DFCB} (iTunesDetector Class) - http://ax.phobos.apple.com.edgesuite...ITDetector.cab
O16 - DPF: {E0B795B4-FD95-4ABD-A375-27962EFCE8CF} (StarInstall Control) - http://www.stardialer.de/install/StarInstall.ocx
O23 - Service: AntiVir Service (AntiVirService) - H+BEDV Datentechnik GmbH - C:\Programme\AVPersonal\AVGUARD.EXE
O23 - Service: AntiVir Update (AVWUpSrv) - H+BEDV Datentechnik GmbH, Germany - C:\Programme\AVPersonal\AVWUPSRV.EXE
O23 - Service: Sygate Personal Firewall (SmcService) - Sygate Technologies, Inc. - C:\Programme\Sygate\SPF\smc.exe
O23 - Service: TrueVector Internet Monitor (vsmon) - Zone Labs Inc. - C:\WINDOWS\system32\ZoneLabs\vsmon.exe

hi

backdoor ist über das logfile keiner zu finden, "nur"

X MSMsgSvc MSMSGSVC.exe Browser hijacker, identified by some antiviruses as a variant of the StartPage.QC TROJAN!
Virusinformation Troj/CWS-C http://www.sophos.de/virusinfo/analyses/trojcwsc.html#

und dieser dialer, aber dialer könnten auch bewusst installiert worden sein, wenn nicht -> daten sichern !!!

016 - DPF: {E0B795B4-FD95-4ABD-A375-27962EFCE8CF} (StarInstall Control) - http://www.stardialer.de/install/StarInstall.ocx

lege dir vor der Neuinstallation die benötigte software zurecht
(mit einem sauberen rechner downloaden, brennen )