The file 'Asms' on Windows XP Professional CD-ROM is needed.


While repairing a Windows XP installation on my friend's computer, it ran into a strange problem.

"Files Needed"
The file 'Asms' on Windows XP Professional CD-ROM is needed. Type the path where the file is located, and then click OK.


Solution A:

The tricks from Microsoft's KB didn't work for me, but it may for you. The instructions are fairly straight forward, but heres a translation to make things a bit simpler.

Note: Only use this if you're using NTFS for your partition. Otherwise, see the linked KB above.

  • When the dialog appears, press "Shift + F10".
  • Type in "regedit" and press enter.
  • Click "File"
  • "Load Hive"
  • Type in "%Windir%\System32\Config\System.sav"
  • Enter "Test"
  • Go to "HKEY_LOCAL_MACHINE\Test\ControlSet1\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}"
  • Delete any items in the right panel called "UPPERFILTERS" or "LOWERFILTERS"
  • Now go back to "HKEY_LOCAL_MACHINE\Test" and see if there are any other "ControlSet####" keys.
  • Drill into "Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}" for that keys and delete any "UPPERFILTERS" or "LOWERFILTERS" items. Repeat for all "ControlSet####" keys.
  • Close the Registry Editor.
  • Try clicking OK on the setup error to continue.
  • If it doesn't work, cancel and try restarting to resume the setup.

That seems to be the solution that works for most people. For me, I used Solution B.

Solution B:

This is the one that worked for me. The majority of user advice seemed to stem from the fact that the DVD/CD drive not being loaded properly. I kinda winged it using an educated guess.

  • Press "Shift + F10"
  • Type in "sysdm.cpl" and press enter
  • Go to "Hardware" tab
  • Click "Device Manager"
  • If the items under "DVD/CD-ROM drives" have a little yellow exclamation mark on them, right-click on it and select "Update driver"
  • Select "No, not this time"
  • Select "Install from a list or specific location (Advanced)"
  • Select "Don't search, I will choose the driver to install"
  • Select the first generic "CD Rom Drive" driver.
  • Finish the setup and it should load up your DVD drives.
  • Now, continue with the Windows XP repair by replacing "GLOBALROOT\DEVICE\CDROM0\I386" with "X:\I386"
  • Copy this into clipboard, you'll need it. (Yes, clipboard works even during setup! How awesome! Eat that crApple iPhone!)
  • Whenever the next popup appears, paste and press enter. You'll need to do this alot of times throughout the setup.

Solution C:

Try some of the solutions suggested here.

Some people claim that ejecting the CD and then putting it back in works. Others claim a full power cycle of your computer (turning it off for a while and unplugging the power) will work.

To be honest, I found that a clean install proved to be much better than a repair. It seemed to cause more trouble in the long run.



  1. I had the same problem, nothing helped, regedit is unknown command, etc.

    However, I noticed that during the initial installation my cd drive became quite warm, so I kept it open for ten minutes to let it cool down. Then, trying to let the installation look for the file again from e:/i386 - and it was found! Must have just been a heat problem with the cd-drive.

  2. Hi Twig,

    Its a great and superb work, its working fine.

    Bharath P

  3. Hi! This article helped me. Btw I couldnt run regedit, neither device manager. I found my installation folder through command prompt (in my case it was from usb, disk D:) and replaced path in dialog...
    And thanks for copy paste tip! It was really helpfull. :)
    Greetings from Serbia!
    PS: Sorry for bad english.

    1. No problems Ivica!

      Don't worry, your English from Serbia is pretty good, much better English than the comments I see on YouTube =)

  4. the 1rst option does not work for me.... the 2nd option only work to Click "Device Manager" and after that nothing comes up it say error so What the hell I suspostu do???? any idea????please let me know..

    1. "it say error"
      What error?

      You might have a bad installation, try downloading it and check the file hash (MD5 or SHA1)

  5. i try everything as the links show above but I still have the same problem so I dont know what the f... I supposed to do!!! i type in cmd regedit and regedit.exe does not work I copy this file 1386 it does not work too... so and idea??? but not stupid idea!!! please let me know. cheers

  6. I had the same damn problem...I wasted a day and couldn't find a way to solve it...the next day I tried one last time and it didn't show the message again,it solved it's self.... i dont know how but now it works....

  7. Thank you for the fine work! Solution B was perfect for solving my issue. Thank you again!!

  8. Thanks to those hints stated. My problem solved by just eject the CD/DVD drive for a 2 seconds and push back.

  9. To get this problem fixed I shut the laptop off and the external CD-ROM after I had this error. Waited 5 seconds and powered the CD ROM up first and than the laptop. The computer found drive and the installed started and completed. I hope this helps. It looks like Windows losses track of the drive. This was on a Dell XP re-install DISK SP3

  10. I have the same problem, all you need to do (if u facing this error on a mini notebook with external cd rom) is to disable the SD Card on Bios.

  11. Thanx i didn't fix my problem but i learn a lot.Obrigado Twig-i will buy u beer next time.

    1. No problems, I learned a little Portuguese in return!
      Obrigado ROCK ;)

  12. Ok none of the above worked for me - it seems that on restarting for the second part of the install my pc couldnt see GLOBALROOT\DEVICE\CDROM as the optical drive, so for each dll or inf file it prompted for i just changed the above to D:\

    simples :)

  13. I've got the same problem with installing windows xp from bootable USB. My solution is making a new bootable windows with intagrated drivers using Nlite and installing.


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