Results 1 to 6 of 6
  1. #1


    Member Since
    Aug 08, 2010
    Location
    Muscat, Oman
    Posts
    11
    Specs:
    Mac7.1, Intel Core 2 Duo, Processor Speed: 2 GHz, Memory:2 GB, Bus Speed:800 MHz
    System extension cannot be used
    Hey guys

    For some reason I'm getting this message

    SYSTEM EXTENSIONS CANNOT BE USED

    the system extension "/usr/local/vscanx/extensions/virex.kext" was installed improperly and cannot be used. Please try reinstalling it, or contact the product's vendor for an update.


    Now i don't think i installed an application file, so i got no idea where this is coming from

    Another thing i have noticed was i cannot empty my trash? are these two related?
    And how do i get rid of this?

    all advice would be appreciated

  2. #2

    Buzzard2010's Avatar
    Member Since
    Oct 22, 2010
    Location
    Bretforton, Worcestershire
    Posts
    2,571
    Specs:
    MacBook Pro 15" 2014, 2.2GHz i7, 16GB RAM, 250GB SSD, OSX 10.9.5 - iPhone 5s 16gb
    Have you got McAffee installed at all?

    - Simon

    If you have been helped, don't forget to use the Reputation system at the top right of their post.
    May 2011
    Nominated: March 2011 & April 2011

  3. #3


    Member Since
    Aug 08, 2010
    Location
    Muscat, Oman
    Posts
    11
    Specs:
    Mac7.1, Intel Core 2 Duo, Processor Speed: 2 GHz, Memory:2 GB, Bus Speed:800 MHz
    Quote Originally Posted by Buzzard2010 View Post
    Have you got McAffee installed at all?

    - Simon
    No i haven't
    Where did this come from and how do i get rid of it?


    qib

  4. #4

    Buzzard2010's Avatar
    Member Since
    Oct 22, 2010
    Location
    Bretforton, Worcestershire
    Posts
    2,571
    Specs:
    MacBook Pro 15" 2014, 2.2GHz i7, 16GB RAM, 250GB SSD, OSX 10.9.5 - iPhone 5s 16gb
    It is part of a virus scanner, program you may have installed. Have you installed any antivirus software? If so then you can uninstall it no problems.

    - Simon

    If you have been helped, don't forget to use the Reputation system at the top right of their post.
    May 2011
    Nominated: March 2011 & April 2011

  5. #5


    Member Since
    Aug 08, 2010
    Location
    Muscat, Oman
    Posts
    11
    Specs:
    Mac7.1, Intel Core 2 Duo, Processor Speed: 2 GHz, Memory:2 GB, Bus Speed:800 MHz
    Quote Originally Posted by Buzzard2010 View Post
    It is part of a virus scanner, program you may have installed. Have you installed any antivirus software? If so then you can uninstall it no problems.

    - Simon
    Hey simon

    thanks for the help

    As far as i know i haven't installed any virus scanner, i have no idea where this has come from

    I did use a new USB today, would that have caused it?

    also i was going through a few discussion boards and came across this solution

    .kext file installed improperly and cannot be used
    Posted: Nov 24, 2008 2:03 PM

    If you see this error, after an update or rebuild of your system....

    The system extension "/System/Library/Extentions/IO80211Family.kext/Contents/Plugins/AirPortAtheros.kext" was installed improperly and cannot be used. Please try reinstalling it, or contact the product's vendor for an update.

    Check to confirm the permissions on the kext file and all of the files inside.

    1. open hard drive > System > Library > Extensions
    2. Find the extension in question
    3. Right click on the kext file > Show Package Contents
    4. Change permissions
    Owner = System (read/write)
    Group = wheel (read only)
    Guest = (read only)
    5. repeat and confirm for ALL files within the Package Contents (try using 'apply privis to enclosed')

    "kext" means kernel extension; similar to "extensions" in OS 9.

    now the thing is, i can't find that file

    What should i do?

    Qib

  6. #6

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    21,702
    Specs:
    Imac 27" Retina 3.3GHz, 512GB Flash, 16GB memory, OS X.11.4.
    Sure sounds like the computer has had Virex or some other antivirus software installed at some point, maybe before you got it? AV software must be removed using an uninstaller usually available from the manufacturer's web site. Otherwise little pieces are left behind, which is perhaps what you may be seeing.
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. System Extension Cannot Be Used
    By CatherineWatson in forum OS X - Operating System
    Replies: 1
    Last Post: 10-12-2014, 03:24 PM
  2. System Extension cannot be used
    By sbglaus in forum Apple Desktops
    Replies: 4
    Last Post: 09-20-2014, 06:04 AM
  3. System Extension Cannot Be Used
    By JasonCK in forum OS X - Operating System
    Replies: 9
    Last Post: 02-28-2013, 02:53 PM
  4. System extension cannot be used
    By annastasiabeal in forum OS X - Operating System
    Replies: 2
    Last Post: 07-17-2012, 01:29 PM
  5. System Extension Cannot be Used
    By dwalker in forum OS X - Operating System
    Replies: 1
    Last Post: 08-21-2007, 12:03 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •