Invalid MS-DOS

Discussion in 'Windows 10 Help and Support' started by PaulStephen, Mar 18, 2016.

  1. PaulStephen

    PaulStephen New Member

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    Hello. I am having an issue. Whenever I try to delete or move an item, a message pops up and displays "Invalid MS-DOS Function" I can't seem to get past it so can someone help me? Thanks!

    PS I'm new to this forum so.......
     
  2. Josephur

    Josephur Windows Forum Admin
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    I've seen this problem, and it's origin and resolution is kind of a puzzle. Many people have had this problem and there are multiple solutions which seem to have worked for them. Try these (reboot between each and try deleting your files)

    1) Do a "chkdsk /f /r C:" at an administrative command prompt, allow it to run and finish (make take some time)
    2) Defrag the hard drive using the Windows defrag tool
    3) Run "sfc /scannow" at an administrative command prompt
    4) Run "DISM /Online /Cleanup-image /Restorehealth" at an administrative command prompt

    Would be interested in knowing which if any of these steps has resolved the issue for you.
     
  3. PaulStephen

    PaulStephen New Member

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    If you mean reboot, doesn't that delete everything off your computer?
     
  4. patcooke

    patcooke Microsoft MVP
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    No - that would be a re-install - reboot just means power off (log off, not just switch off) and back on again.
     
  5. PaulStephen

    PaulStephen New Member

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    So, it just logs you off and logs you back on? Is that what you mean?

    By the way, I have heard about the method of defragment and optimize drives. I optimized the storage (for mines, it's HP (C:)). And I've waited (yesterday) for like 5 hours. And I've wondered, how long is it suppose to take? Also, is it good to use this method? The steps for this method is.....




    Step 1: Search for Defragment and Optimize Drives and then open it.

    Step 2: Click on whatever storage drive you are using.

    Step 3: Then click optimize

    Step 4: Wait until this is finished then restart you computer.
     

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