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Posted 23 December 2015 - 06:15 AM
Posted 23 December 2015 - 07:08 AM
Have you completely removed your previous anti-virus? Also, try running the uninstaller for the previous anti-virus to clean up any leftover remnants. I have a list of them here: http://www.carrona.org/avuninst.html
Double check to be sure that all Windows Updates were successfully installed.
Did you try other free scans to see if the system is infected? Here's a list of a few free scans (from this link: https://www.us-cert.gov/ncas/alerts/TA15-286A ):
https://www.f-secure.com/en/web/home_global/online-scanner (link is external)
http://www.mcafee.com/uk/downloads/free-tools/stinger.aspx (link is external)
http://www.microsoft.com/security/scanner/en-us/default.aspx (link is external)
https://www.sophos.com/en-us/products/free-tools/virus-removal-tool.aspx (link is external)
http://housecall.trendmicro.com/ (link is external)
The above are examples only and do not constitute an exhaustive list. The U.S. Government does not endorse or support any particular product or vendor.
If that doesn't fix it, then try this: http://answers.microsoft.com/en-us/protect/forum/protect_defender-protect_start/windows-defender-error-code-0x8007139f/93096739-16ce-471b-8716-1776f0c69f89
Edited by usasma, 23 December 2015 - 07:09 AM.
Posted 24 December 2015 - 03:06 AM
I have tried to open to scan the system http://www.microsoft.com/security/scanner/en-us/default.aspx (link is external) but in an address bar, shield icon keeps blinking and a page won't load.
Posted 25 December 2015 - 06:24 AM
Looks like that page is broken (I get the same behavior). Have you tried any of the other links?
I tried it in Firefox and got that behavior.
I tried it in Edge and it worked just fine.
I tried it in IE11 and had a couple of crashes before it settled down and worked.
Edited by usasma, 25 December 2015 - 06:26 AM.
Posted 27 December 2015 - 02:25 AM
Don't bother with WinDef, it's the lowest rated AV in the world, by a large margin, just check any AV test site, it's always at the bottom of the list.
Use a good one, free are Bitdefender, Avast, Avira. Paid, the top of the heap is Kaspersky.
That being said, if you are bound and determined to use WinDef, here's the fix:
Posted 03 November 2016 - 10:56 PM
There's a bulk of solutions for fixing this error. Try one by one until the issue fixed. For my case, I just reset the PC & done
1. Restart your PC
2. Remove existing antivirus and antispyware software
3. Scan your PC for malwares
4. SFC scan
5. Clean Boot
6. Restart Security Center Service
7. Delete conflicting Registry Entry
For step-by-tep, you can also refer to the source post here: How to fix Error 0x8007139f when scanning with Windows Defender?
Posted 04 November 2016 - 03:29 AM
This problem may occur after Windows Defender is updated, To resolve this problem, follow these steps:
Hope this helps. If you need further assistance with Windows, let us know and will be glad to help.
Posted 07 November 2016 - 02:18 PM
Do not use Windows Defender for anything. It is rated as the worst AV in the world by many test centers. Look it up.
Look up best AV's 2016, use any one of the top, namely:
Any of those will work fine.
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