Du müßtest jetzt eigentlich wieder normal starten können. Mach das mal und dann bitte einmal:
Scan mit Farbar's Service Scanner

Downloade dir bitte Farbar's Service Scanner

• Starte das Tool mit Doppelklick auf die FSS.exe
• Gehe sicher, dass folgende Optionen angehakt sind.
  • Internet Services
  • Windows Firewall
  • System Restore
  • Security Center/Action Center
  • Windows Update
  • Windows Defender
  • Other Services
• Klicke auf Scan.
• Wenn das Tool fertig ist, wird es eine FSS.txt in dem Verzeichnis erstellen, wo das Tool gelaufen ist.

Poste bitte den Inhalt hier.

Normalstart ging nun ohne Fehler.

Folgende FSS.txt ist bei rausgekommen:

Farbar Service Scanner Version: 20-02-2013
Ran by Media (administrator) on 01-03-2013 at 14:09:53
Running from "C:\Users\Media\Desktop"
Windows Vista (TM) Home Premium Service Pack 2 (X86)
Boot Mode: Normal
****************************************************************

Internet Services:
============

Connection Status:
==============
Localhost is accessible.
There is no connection to network.
Attempt to access Google IP returned error. 
Attempt to access Google.com returned error: Other errors
Attempt to access Yahoo IP returned error. 
Attempt to access Yahoo.com returned error: Other errors


Windows Firewall:
=============

Firewall Disabled Policy: 
==================
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile]
"EnableFirewall"=DWORD:0


System Restore:
============

System Restore Disabled Policy: 
========================


Security Center:
============
wscsvc Service is not running. Checking service configuration:
The start type of wscsvc service is OK.
The ImagePath of wscsvc service is OK.
The ServiceDll of wscsvc service is OK.
Checking LEGACY_wscsvc: ATTENTION!=====> Unable to open LEGACY_wscsvc\0000 registry key. The key does not exist.


Windows Update:
============
wuauserv Service is not running. Checking service configuration:
The start type of wuauserv service is OK.
The ImagePath of wuauserv service is OK.
The ServiceDll of wuauserv service is OK.


Windows Autoupdate Disabled Policy: 
============================


Windows Defender:
==============
WinDefend Service is not running. Checking service configuration:
The start type of WinDefend service is set to Demand. The default start type is Auto.
The ImagePath of WinDefend service is OK.
The ServiceDll of WinDefend service is OK.


Windows Defender Disabled Policy: 
==========================
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender]
"DisableAntiSpyware"=DWORD:1


Other Services:
==============


File Check:
========
C:\Windows\system32\nsisvc.dll => MD5 is legit
C:\Windows\system32\Drivers\nsiproxy.sys => MD5 is legit
C:\Windows\system32\dhcpcsvc.dll => MD5 is legit
C:\Windows\system32\Drivers\afd.sys => MD5 is legit
C:\Windows\system32\Drivers\tdx.sys => MD5 is legit
C:\Windows\system32\Drivers\tcpip.sys
[2013-02-14 13:43] - [2013-01-04 12:28] - 0905576 ____A (Microsoft Corporation) 74E2D020C47BB2B2FCCBA29A518A7EB4

C:\Windows\system32\dnsrslvr.dll => MD5 is legit
C:\Windows\system32\mpssvc.dll => MD5 is legit
C:\Windows\system32\bfe.dll => MD5 is legit
C:\Windows\system32\Drivers\mpsdrv.sys => MD5 is legit
C:\Windows\system32\SDRSVC.dll => MD5 is legit
C:\Windows\system32\vssvc.exe => MD5 is legit
C:\Windows\system32\wscsvc.dll => MD5 is legit
C:\Windows\system32\wbem\WMIsvc.dll => MD5 is legit
C:\Windows\system32\wuaueng.dll => MD5 is legit
C:\Windows\system32\qmgr.dll => MD5 is legit
C:\Windows\system32\es.dll => MD5 is legit
C:\Windows\system32\cryptsvc.dll => MD5 is legit
C:\Program Files\Windows Defender\MpSvc.dll => MD5 is legit
C:\Windows\system32\ipnathlp.dll => MD5 is legit
C:\Windows\system32\iphlpsvc.dll => MD5 is legit
C:\Windows\system32\svchost.exe => MD5 is legit
C:\Windows\system32\rpcss.dll => MD5 is legit


**** End of log ****