Posted 19 October 2011 - 06:50 PM
I am running windows vista home premium, 32 bit with SP2. Recently I unexpectedly discovered I can't start windows defender.
When I click control panel>programs>change start up programs, I get a windows defender alert saying defender is turned off. If I close the alert, I am not taken to the start up list... nothing happens other than the alert closing. So, problem #1 is I cannot access the start up program editor via control panel. But, I can run msconfig and edit start up programs there.
Problem #2 is I cannot enable windows defender. The windows defender alert that is prompted from clicking "change start up programs" also has a link to enable windows defender. If I click the link the alert either hangs and becomes unresponsive or I get an error alert that says to start defender manually with error code 0x800106ba.
So, I attempted to manually start defender using services.msc to "start" defender (I also changed defender from manual to automatic). However, defender does not start and I get an error message saying defender "started and then stopped." I also get the same error code (0x800106ba) if I try to turn on defender from control panel>security>windows defender.
I do not know how long I have had these problems as I haven't had defender turned on in a while and I had never used control panel to edit the start up programs until today. However, I recently uninstalled Avast, Ad Aware and Malewarebytes and installed Microsoft Security Essentials. Also, I do not and have not ever had any virus symptoms (I do scans regularly)... I'm thinking one of the anti-virus programs maybe corrupted defender?
Any help would be very much appreciated.