How-To Geek

Fix Problems With Copying Large Files in Windows Vista

If you’ve been having problems copying large files over mapped drives, network disconnects, or having to reboot your router a lot more often than normal, then you can try out this fix to solve the problem.

The problem stems from the new auto-tuning network, which changes the receive window on the fly. Thankfully we can easily turn it off from an administrative mode command prompt.

Open Administrative Mode Command Prompt

Either type cmd into the start menu and use Ctrl+Shift+Enter or right-click the Command Prompt shortcut and choose Run as Administrator.

Turn Off Auto-Tuning

netsh int tcp set global autotuninglevel=disabled

You’ll have to reboot your system, but once you do, the problems should be resolved. If they are not you can always turn auto-tuning back on.

Turn On Auto-Tuning

netsh int tcp set global autotuninglevel=normal

For more information on this topic, you can read this article from MSDN blogs.

Lowell Heddings, better known online as the How-To Geek, spends all his free time bringing you fresh geekery on a daily basis. You can follow him on if you'd like.

  • Published 04/21/07

Comments (26)

  1. Everton

    Geek – you’re a star! this has really been bugging me.

    Another one for you – any idea how to remove the need to login to view shared folders?

  2. Video_freak

    Yes! Ah this is going to save me sooo much time. Thanks a bunch!
    I thought this was a bug in Vista, but it’s all gone now. :)

  3. Madam J

    this is awesome!..I nearly pulled my hair out dealing with Vista’s asenine feature (what the heck happened to the “Yes to All” button?)…this solution helped, though it was still a bit slow it was not nearly as slow as 230 days remaining…

    you rock!

  4. zdawgz

    Just tried and I get: Set global command failed on IPv4 The requested operation requires elevation?

  5. The Geek


    administrative mode command prompt…

  6. Jenny

    My windows xp system hangs (blue screen of death) when i try to copy files larger then 4 GB to my a nfs mounted filesystem (solaris9). I have unix for windows installed on my xp system. I can copy the files from the solaris to the windows system without problems…but the windows systems always hangs when i try to copy back to the nfs filesystem. Help!

  7. Robin

    I’m sad to report that this doesn’t work at all for me :(

    If anything I think its making it worse. Now if I try copying files from my vista box to my xp box it hangs almost instantly after it starts copying. Quite annoying. Hopefully microsoft will fix all this in SP1.

  8. Melina

    Hi there,

    any chance you could help me out? This fix doesn’t solve my problem: copy my OS ghost image to another drive for recovery over ext hdd :( (Original file on DVD and is approx 5GB)

    Thak you in advance..

  9. Agustin

    Damn!!! I upgrade mi Vista to SP1, and the problem stills there!!! I disabled all features that I don´t need on Networks…. I do all that recommends on this page, and the problem stills there, I can´t copy large files from a machine running XP to my machine running vista….
    But the strange thing is that if I command to copy the files from the xp machine, works flawlessly!!!

    Any suggestions? Thanks in advance.

  10. Barry

    Same here. I’m running SP1, tried disabling the auto tuning and its definitely worse. The robocopy and copying to a mapped drive workarounds don’t work either. Grinds to a halt and then fails.

  11. Faizan Khan

    hi guys

    I was also facing the same problem . i have also tried all the possible solutions available on the internet and this site as well, but nothing works for me.

    finally i decided to do somesthing , and i discovered the solution.So if nothing works for you guys also , do the following steps

    Just go the network adapter setting and clicks on ‘Configure’ button for the settings
    and under ‘Link Speed’ tab go to ‘Speed and Duplex’ and select the ‘Auto Negotiation’

    After apply above steps ,I hope slow file copy problem will be solved


  12. sniDer

    Mmm… another solution would be using SyncToy. That program is really good. Give it a try.

  13. Ahmer

    My computer has been problems due to windows XP pro.When computer restart or start so any file copy very slowly but 2nd attem is normal behavear

    plz plz answer

  14. Oksana

    This has really helped! I reinstalled my Vista on my new VAIO probably 25 times now trying to solve this thinking it was due to program compatibility!

  15. Tom

    This is also a fix windows live messenger failing to logon.

    Hopefully Microsoft will ONEDAY release a flawless operating system.

  16. ghada

    i have so many emails attachments send to me, but most do not open and most of them are temp folder. Please sole this problem for me as soon as possible. Many thanks in advance.

  17. Ed Simms

    I found a workaround.
    It’s time consuming, but it worked for me when non eof the above mentioned solutions did.
    Use Winrar.
    1 – Select (hilite) what you want to move … manually browse to where you want to create the rar file. (which is where you want to copy/paste move files to)
    2 – Create the rar file. (The created rar file should now be in the destination folder)
    3 – Unrar the file in the destination folder and your files are moved..
    I know it’s a pain.. it’s an insane way to copy/paste/move large files, but it’s the only thing that’s worked for me.
    I guess it would work with winzip or any other compression utlitily that allows you to select source files and a separate “created” compressed file destination, but I’ve only ever done this method with winrar.
    Hope this helps someone..

  18. J. Snijder

    Just used this tweak on W7, looks like it solved my problems regarding copying too.

  19. Mago

    Iam trying this now.. had this issue with divx movies moste.. so i thought it was a DRM fault.

  20. William Kimball

    I am suffering this problem and would very much like to try your solution, but on Windows 7 Professional 64-bit, the proposed command results in an error as follows:

    Microsoft Windows [Version 6.1.7600]
    Copyright (c) 2009 Microsoft Corporation. All rights reserved.

    C:\Windows\system32>netsh int tcp set global autotuninglevel=disabled

    Set global command failed on IPv4 The parameter is incorrect.

  21. Martinez

    Ed Simms


  22. tf

    Works fine for me in Win 7 x64 pro…

  23. pradeep

    i am using a 4 system with windows vista business OS an all systems when i try to copying large files over network system hangs up
    i tried you cmd

    C:\>netsh int tcp set global autotuninglevel=disabled

    it shows an error message as

    global command failed on ipv4 the requested operation requires elevation

    please tell me the

  24. Hunter-14

    Muito Obrigado!!!!

    Very Nice!

  25. lost and confused

    Hi there,

    My vista C drive has been getting fuller day by day and i intend to fix this problem soon, but the million dollar question is why the heck is my Windows file 17 GB? What can i do at the moment to free some space until i buy a new one. No more turtle vista!

    Toshiba 14″ 500GB Or for 70$ cheaper an HP 14.5″ Pavillon g series 750 GB

    Thank you in advance

  26. M

    Mother F***R

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