Windows 10: i cant start windows defender after a virus on my pc error 0x800700aa

Discus and support i cant start windows defender after a virus on my pc error 0x800700aa in AntiVirus, Firewalls and System Security to solve the problem; i had a virus on my pc and i got it out but my windows defender is damaged. i already did all the scans like sfc and removed the virus but i cant re... Discussion in 'AntiVirus, Firewalls and System Security' started by xdarkmario, Sep 4, 2017.

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  1. XDARKMARIO
    xdarkmario Win User

    i cant start windows defender after a virus on my pc error 0x800700aa


    i had a virus on my pc and i got it out but my windows defender is damaged. i already did all the scans like sfc and removed the virus but i cant re enable the windows defender, i just get 0x800700aa.

    :)
     
    xdarkmario, Sep 4, 2017
    #1
  2. ANTHONYHALE213
    AnthonyHale213 Win User

    Windows defender

    Every time I try to start windows defender it says service couldn't be started and an error code that says this 0x800700aa. If you could help that would be great.

    **moved from Virus and Malware / Windows Defender / Scanning, Detecting, and Removing Threats / Windows 10
     
    AnthonyHale213, Sep 4, 2017
    #2
  3. CBRITZ6565
    cbritz6565 Win User
    windows defender antivirus

    Why does my windows defender says that the requested resource is in use when I try to turn it on. The error code is 0x800700aa.
     
    cbritz6565, Sep 4, 2017
    #3
  4. CALEDON KEN
    Caledon Ken Win User

    i cant start windows defender after a virus on my pc error 0x800700aa

    Hi xdarkmario.

    If you are absolutely sure the pest is gone you could try an in place repair / upgrade. I would backup my data files at a minimum and would even consider creating an image with a toll like Macrium Reflect.

    Repair Install Windows 10 with an In-place Upgrade

    This process will upgrade you to V1703 if you are not already using Creator Update, FYI.


    Ken
     
    Caledon Ken, Sep 4, 2017
    #4
  5. XDARKMARIO
    xdarkmario Win User
    I actually got it working by forcing to safe mode via command prompt and then changing back to regular mode via msconfig.
     
    xdarkmario, Sep 5, 2017
    #5
  6. CALEDON KEN
    Caledon Ken Win User
    Great. The repair process listed in the tutorial may fix other things that your bug caused that you have not experienced yet. No need to run now but if you do find some other quirky things you can look at it.

    Thanks for posting your solution.
     
    Caledon Ken, Sep 5, 2017
    #6
  7. XDARKMARIO
    xdarkmario Win User
    Edit, it's not working after rebooting. Back to square one.
     
    xdarkmario, Sep 5, 2017
    #7
  8. BREE
    Bree New Member

    i cant start windows defender after a virus on my pc error 0x800700aa

    Seems you did not in fact get everything out. *Sad Apparently there's a process left that's disabling Defender when you restart. What did you use to try and get rid of the virus?

    My first step would be to run Rkill. That will stop known malicious services then, without restarting, immediately run AdwCleaner.
    Download RKill
    AdwCleaner - Free Adware Cleaner & Removal Tool
     
    Bree, Sep 5, 2017
    #8
  9. XDARKMARIO
    xdarkmario Win User
    I ran adw cleaner, I'm not getting the browser popups a i did before and looking on the task manager there's no apps running that are out of place
     
    xdarkmario, Sep 5, 2017
    #9
  10. BREE
    Bree New Member
    What did it say it found? AdwCleaner writes its log to a text file in C:\AdwCleaner
     
    Bree, Sep 5, 2017
    #10
  11. XDARKMARIO
    xdarkmario Win User
    xdarkmario, Sep 5, 2017
    #11
  12. CALEDON KEN
    Caledon Ken Win User
    Looks like it took a number of keys out of registry.

    Have you tried the in place repair / upgrade? (with the backups in place)
     
    Caledon Ken, Sep 5, 2017
    #12
  13. TAIRIKUOKAMI
    TairikuOkami Win User

    i cant start windows defender after a virus on my pc error 0x800700aa

    Run "Enable WD" as admin and restart. If services report access denied, run it in safe mode.
     
    TairikuOkami, Sep 5, 2017
    #13
  14. XDARKMARIO
    xdarkmario Win User
    didint work in safe mode or regular
     
    xdarkmario, Sep 5, 2017
    #14
  15. XDARKMARIO
    xdarkmario Win User
    Fixed! the issue was a virus installed driver called "mouybfil.sys" booting to microsoft DART or using a linux distro and manually going to C:\Windows\System32\drivers\ and removing the driver fixed the issue a and the virus is gone
     
    xdarkmario, Sep 5, 2017
    #15
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