Recently Windows has not started without me starting it from the security centre usually after a few tries. Now it won't start at all. I have recently installed Microsft Security Essentials."Windows Defender encountered an error: 0x800106ba. A problem caused this program's service to stop. To start the service restart the computer or search help and Support on how to start a service manually."I am unable to restart manually via the Security Centre or undertaking a computer "Restart".(The only program files under Vista Home Premium - Vista (C): Programs Windows Defender. File version 1.1.1600.0. I have all the latest Vista updates on my system. Downloading them is not a problem.)Can this problem be resolved. Do I need Windows Defender now that I have Microsoft Security Essentials? Any help would be appreciated.

Hi, Microsoft Security Essentials should disable Windows Defender on Vista. In some cases, this does not happen automatically. Then, you should disable it to prevent conflicts. Windows Defender cannot be uninstalled from Vista. For more information, please refer to the this thread: Windows Defender and Microsoft Security Essentials http://social.answers.microsoft.com/Forums/en-US/msestart/thread/5309cb8d-02e1-40e8-974f-0dcedb9ab9fd Regards, Bruce

Thank you for your early response.Without Windows Defender there is no access to start programs (in detail). I have to use other “free software” with less detail facilities.The problem threw up an additional issue. When I was repeatedly trying to activate WD the system came up with “Windows host process (Rundll32) has stopped working”. This, eventually, got me running a system scan:Windows system 32 >Sfc /scannow-------------------------------------------------------------------------------------------------------------Microsoft Windows [Version 6.0.6002]Copyright (c) 2006 Microsoft Corporation. All rights reserved.C:\Windows\system32>sfc /scannowBeginning system scan. This process will take some time.Beginning verification phase of system scan.Verification 100% completed. Windows Resource Protection found corrupt files but was unable to fix some of them.Details are included in the CBS.Log windir\Logs\CBS\CBS.log. For exampleC:\Windows\Logs\CBS\CBS.logC:\Windows\system32>findstr /c:"[SR]" %windir%\logs\cbs\cbs.log>sfcdetails.txtC:\Windows\system32>------------------------------------------------------------------------------------------------------------The sfcdetails list with a some exceptions gave:2010-03-10 17:45:11, Info CSI 00000006 [SR] Verifying 100 (0x00000064) components2010-03-10 17:45:11, Info CSI 00000007 [SR] Beginning Verify and Repair transaction2010-03-10 17:45:22, Info CSI 00000009 [SR] Verify completeThe exceptions were:2010-03-10 18:00:46, Info CSI 0000019a [SR] Verifying 85 (0x00000055) components2010-03-10 18:00:46, Info CSI 0000019b [SR] Beginning Verify and Repair transaction2010-03-10 18:00:58, Info CSI 000001a6 [SR] Verify complete2010-03-10 18:00:58, Info CSI 000001a7 [SR] Repairing 0 components 2010-03-10 20:10:44, Info CSI 0000019a [SR] Verifying 85 (0x00000055) components2010-03-10 20:10:44, Info CSI 0000019b [SR] Beginning Verify and Repair transaction2010-03-10 20:10:51, Info CSI 000001a6 [SR] Verify complete2010-03-10 20:10:51, Info CSI 000001a7 [SR] Repairing 0 components 2010-03-11 11:17:23, Info CSI 0000019a [SR] Verifying 85 (0x00000055) components2010-03-11 11:17:23, Info CSI 0000019b [SR] Beginning Verify and Repair transaction2010-03-11 11:17:30, Info CSI 000001a6 [SR] Verify complete2010-03-11 11:17:30, Info CSI 000001a7 [SR] Repairing 0 components2010-03-11 11:17:30, Info CSI 000001a8 [SR] Beginning Verify and Repair transaction2010-03-11 11:17:30, Info CSI 000001aa [SR] Repair complete2010-03-11 15:13:47, Info CSI 0000019a [SR] Verifying 85 (0x00000055) components2010-03-11 15:13:47, Info CSI 0000019b [SR] Beginning Verify and Repair transaction2010-03-11 15:13:57, Info CSI 000001a6 [SR] Verify complete2010-03-11 15:13:57, Info CSI 000001a7 [SR] Repairing 0 components2010-03-11 15:13:57, Info CSI 000001a8 [SR] Beginning Verify and Repair transaction2010-03-11 15:13:57, Info CSI 000001aa [SR] Repair completeShould, can I correct these issues?Whether these were related I don't know there is not enough info for me to understand what the above means. Can you direct me to a remedy or can these best be left alone?

Hi, As the problem happens on Windows Vista and we mainly focus on the questions about Windows Server system, for quick and accurate response to the question, it is recommended you initial a new thread in the Windows Vista forum. The support professional there are more familiar with it and can help you in a more efficient way. http://social.technet.microsoft.com/Forums/en-US/category/windowsvistaitpro Hope the issue will be resolved soon. Regards, Bruce

Hi I think the best satisfactory explanation for this issue is here Windows Defender and Microsoft Security Essentials Q: How is this different from Windows Defender? A: Windows Defender detects and removes known spyware only. It is not designed to protect against the full breadth of malicious software, and specifically does not prevent viruses, worms, Trojans, and other malicious software from infecting your machine. The new no-cost solution will be a comprehensive anti-malware solution. Q: Is Microsoft Security Essentials designed to replace Windows Defender? A: No but if you are running Microsoft Security Essentials, you do not need to run Windows Defender. Microsoft Security Essentials is designed to disable Windows Defender in order to manage the PC’s real-time protection, including anti-virus, rootkits, Trojans and spyware. Q: Does installing Microsoft Security Essentials disable Windows Defender A: Microsoft Security Essentials should disable Windows Defender on Vista and Windows 7 and uninstall it from XP. In some cases, this does not happen automatically. Q: Do I need to manually disable or uninstall Windows Defender if I am using Microsoft Security Essentials? A: If Microsoft Security Essentials did not automatically disable Windows Defender on Vista or Windows 7, you should disable it to prevent conflicts. Windows Defender cannot be uninstalled from Vista or Windows 7. If Microsoft Security Essentials did not automatically uninstall Windows Defender on XP, you should manually uninstall Windows Defender via Control Panel/Add or Remove Programs. Q: What happens if I do not disable or uninstall Windows Defender if I am using Microsoft Security Essentials? A: If Microsoft Security Essentials and Windows Defender are both running, your system may experience performance degradation and other problems caused by the conflict of two services providing real time protection simultaneously. Best regards Adel

You're missing one of WintersDay's original points and that is if he/she disables Windows Defender how is he/she supposed to change the status of any programs he/she may or may not want to start automatically with Windows. I have the same problem and without Defender running I am stuck with a casino program that starts automatically and when it does it tries to update itself as well. This makes for a very long boot up. I'm tired of it and you're suggesting disabling the only application that I know can fix this issue. This is totally unacceptable!!!