Error 'MS - Dos function' is not a valid Win 7

Win 7 error "invalid MS-DOS function" when copying of outlook PST for the backup file. What causes this and how to fix it. Microsoft has no solution at the moment for this bug that I see a lot of posts similar problem reported all over the web.

Hello

·         Are you able to copy other files?

·         Where are you trying to backup?

Registry warning:

Important: This section, method, or task contains steps that tell you how to modify the registry. However, serious problems can occur if you modify the registry incorrectly. Therefore, make sure that you proceed with caution. For added protection, back up the registry before you edit it. Then you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click on the number below to view the article in the Microsoft Knowledge Base:

How to back up and restore the registry in Windows: http://windows.microsoft.com/en-US/windows7/Back-up-the-registry

Try the following steps to resolve this problem:

a. Click Start, type regedit in the search box and press ENTER.

b. look for, and then click the following registry subkey:

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\System

c. on the Edit menu, point to new, and then click DWORD value.

d. type CopyFileBufferedSynchronousIo to name the new entry, and press ENTER.

e. right-click CopyFileBufferedSynchronousIo and then click on edit.

f. in the value data box, type 1, and then click OK.

g. exit from the registry editor.

Diana

Microsoft Answers Support Engineer

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Tags: Windows

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