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Windows 7: Windows 7 invalid MS-DOS function

12 Nov 2010   #1

Windows 7 Professional x64
 
 
Windows 7 invalid MS-DOS function

Hey guys, im trying to install a copy of Windows 7 Professional x64, obtained through my university's MSDNAA program, on my desktop. Through research, and another thread on this forum i have attempted to make a USB disk to load the .iso onto the desktop, however when moving the files from the iso onto the flash disk it returns the error "Invalid MS-DOS Function" when trying to copy/move the install.wim, install_Windows7 PROFESSIONAL.clg, as well as the other .clg files. What can I do to remedy this issue and get this thing to install?

The computer im attempting to do this on is my Windows 7Pro x86 laptop.

My System SpecsSystem Spec
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12 Nov 2010   #2

Win7 Enterprise, Win7 x86 (Ult 7600), Win7 x64 Ult 7600, TechNet RTM on AMD x64 (2.8Ghz)
 
 

Did you read this tutorial ?

USB Windows 7 Installation Key Drive - Create
My System SpecsSystem Spec
13 Nov 2010   #3

Windows 7 Professional x64
 
 

Yes, I followed that exact tutorial to the tee. I got through the diskpart steps with no problems, but when I go to drag-n-drop the files from the iso to the prepared drive, it gets probably 3/4 the way done then a dialog pops up saying that install.wim is an invalid MS-DOS function with options to Try Again, Skip, or Cancel. If I press try again it comes up with the same error over and over. If I press skip, it will give me the same error for the various .clg files being transferred.
My System SpecsSystem Spec
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13 Nov 2010   #4

Win7 Enterprise, Win7 x86 (Ult 7600), Win7 x64 Ult 7600, TechNet RTM on AMD x64 (2.8Ghz)
 
 

It's been awhile since I made my last USB install flash drive.

But I remember making a folder of the DVD on one of My HD's

Then copying all the files to the USB through the CMD Dos Command with

Copy C:\win7files\*.* F:\

Where F: is the letter of the USB flash drive.

Is the Flash drive 4gb or larger ?
My System SpecsSystem Spec
13 Nov 2010   #5

Windows 7 Professional x64
 
 

I just tried to copy the files from the iso to the flash disk using the cmd prompt, but it encounters the same error (Incorrect function).
The flash disk im using is an 8GB.
My System SpecsSystem Spec
13 Nov 2010   #6

Win7 Enterprise, Win7 x86 (Ult 7600), Win7 x64 Ult 7600, TechNet RTM on AMD x64 (2.8Ghz)
 
 

Do you have the .iso files opened & unpacked to a folder other than the desktop ?

My System SpecsSystem Spec
13 Nov 2010   #7

Windows 7 Professional x64
 
 

At the moment the .iso is mounted to a virtual drive (using MagicDisk), and I was just trying to copy them over by browsing the disk. However, in a moment of inspiration I tried just using WinRAR to extract the .iso directly to the flash disk, and it seemed to transfer the files without error. I'll have to see if it'll actually boot, but at least the files are there. Thanks for the help!
My System SpecsSystem Spec
13 Nov 2010   #8

Win7 Enterprise, Win7 x86 (Ult 7600), Win7 x64 Ult 7600, TechNet RTM on AMD x64 (2.8Ghz)
 
 

Hope that works, let us know
My System SpecsSystem Spec
13 Nov 2010   #9
Microsoft MVP

W 7 64-bit Ultimate
 
 

Hello ParanoidAndroid, welcome to Seven Forums!



We have seen issues with some of the ISOs coming from a "university's MSDNAA program" not being bootable, are you sure the ISO you have is bootable, have you checked to make sure?
My System SpecsSystem Spec
13 Nov 2010   #10

Windows 7 Professional x64
 
 

I would assume that it is, if it is an iso of the standard Windows 7 pro install disk. I had gotten Windows 7 x86, and XP x64 through the same channel and had no problems what-so-ever with them. I haven't been able to test the USB disk that I made last night yet to see if it will indeed run, as I'm out of town for the weekend.
My System SpecsSystem Spec
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 Windows 7 invalid MS-DOS function





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