Windows 8 and 8.1 Forums


Can't do a Windows Defender full scan on one laptop but

  1. #1


    Posts : 136
    Windows 8.1

    Can't do a Windows Defender full scan on one laptop but


    can do it on another laptop without any problems. I have now had to start doing a Custom Scan as the full scan is just so slow that there must an issue with the full scan. Can I fix it or do I just have to carry on doing a Custom Scan only?

      My System SpecsSystem Spec

  2. #2


    Canada
    Posts : 1,950
    windows 8.1 Update 1 Pro 64bit


    Depending on the files it is scanning or if another process is running at the same time it may take a while. Let it do its thing.
      My System SpecsSystem Spec

  3. #3


    Posts : 136
    Windows 8.1


    Quote Originally Posted by Nuccii View Post
    Depending on the files it is scanning or if another process is running at the same time it may take a while. Let it do its thing.

    I don't think it should take more than 10 hours to do a full scan should it? and there is no other process running at the same time. I used to be able to do a full scan in an afternoon but I just can't work out what the problem is now.
      My System SpecsSystem Spec

  4. #4



    Trying to Sith things out
    Bamberg Germany
    Posts : 2,288
    Windows 10 Pro 64 bit


    You can exclude locations(for example my data partition where my photos music videos are excluded, and my backups and system image is too because they are already clean. Also in advanced settings you can turn off scanning removable drives and archive files if you don't make any changes to them. This can speed the scan time up a lot and won't have to choose custom any more.
      My System SpecsSystem Spec

  5. #5


    Trnava
    Posts : 683
    Win 8.1.1 Pro x64


    Windows Defender is just slow, like any Windows software, if you want a fast scan try HitmanPro Free
      My System SpecsSystem Spec

  6. #6


    Posts : 136
    Windows 8.1


    Quote Originally Posted by Cliff S View Post
    You can exclude locations(for example my data partition where my photos music videos are excluded, and my backups and system image is too because they are already clean. Also in advanced settings you can turn off scanning removable drives and archive files if you don't make any changes to them. This can speed the scan time up a lot and won't have to choose custom any more.
    I can try that thanks, I don't understand why one of my laptops can do a WD full scan with no probs and the other one could probably take days if I didn't cancel the scan.
      My System SpecsSystem Spec

  7. #7


    Posts : 136
    Windows 8.1


    Quote Originally Posted by TairikuOkami View Post
    Windows Defender is just slow
    It is very, very slow on this particular laptop

    if you want a fast scan try HitmanPro Free
    I'll look at it thanks.
      My System SpecsSystem Spec

  8. #8


    Posts : 2,627
    win8.1.1 enterprise


    on the slow computer ,try running system file checker .right click on the start button ,open command prompt in admin .type in

    sfc /scannow ,it will/may take 2-3 hrs to do the scan
      My System SpecsSystem Spec

  9. #9


    Austin TX metro area
    Posts : 638
    Windows 7 Pro 64bit [MS blue-disk set]


    Are your laptops close to the same manufacturing date? If not, if they are like mine, a year+ apart, yes, one of mine is slower than the other. If you have twins, then I'm puzzled, unless one laptop runs more gizmos than the other.
      My System SpecsSystem Spec

  10. #10


    Posts : 136
    Windows 8.1


    Quote Originally Posted by caperjack View Post
    on the slow computer ,try running system file checker .right click on the start button ,open command prompt in admin .type in

    sfc /scannow ,it will/may take 2-3 hrs to do the scan

    Thanks, I did an sfc scan about five days ago and found no corruptions, but I could do another one before running Windows Defender again to see if that help.
      My System SpecsSystem Spec

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