You receive an "Error 1327. Invalid Drive: C:\. Installation ended prematurely" error message when you install Office XP System Files Update

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Article ID: 290356 - View products that this article applies to.
This article was previously published under Q290356
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When you run the Office Setup program, you may receive the following error message:
Error 1327. Invalid Drive: C:\

Installation ended prematurely because of an error.
When you click OK, Office Setup quits.

NOTE: This error occurs during the installation of the System Files Update.


This problem can occur if you use the Disk Administrator utility that is included in Microsoft Windows NT 4.0 to change the drive letter of the hard disk where the operating system is installed; for example, the C drive.

The problem occurs because the Office Setup program uses registry keys to determine the locations of certain folders that are required to install Office. If the drive letter of the hard disk that contains the operating system is changed, the registry keys refer to nonexistent folders, and Setup fails.


To resolve this problem, use the Windows NT Disk Administrator utility to restore the drive letter of the hard disk to its original value. To do this, follow these steps:
  1. Click Start, point to Programs, point to Administrative Tools, and then click Disk Administrator.
  2. Right-click the drive whose letter you want to change. On the shortcut menu, click Assign Drive Letter.
  3. Select the correct drive letter from the list, and then click OK.
If you are prompted to quit the Disk Administrator or to restart your computer, do so. After the computer restarts, run Office XP Setup again.


If you use the Disk Administrator utility in Windows NT to change the drive letter of the hard disk where the operating system is installed, you receive the following message:
Changing the drive letter for the windows directory may produce unexpected results. Are you sure you want to continue?


For more articles about how to troubleshoot specific errors in Office Setup:
Click here to view a list of Windows Installer Errors for Office XP articles
For more articles with general information about how to troubleshoot Office errors:
Click here to view a list of Office XP Troubleshooting articles
For more articles about troubleshooting Setup issues with Office XP:
Click here to view a list of Troubleshooting Installation of Office XP: Pick Your Operating System articles


Article ID: 290356 - Last Review: December 4, 2007 - Revision: 2.2
  • Microsoft Windows NT 4.0
  • Microsoft Office XP Professional Edition
  • Microsoft Office XP Small Business Edition
  • Microsoft Office XP Standard Edition
  • Microsoft Office XP Standard Edition for Students and Teachers
  • Microsoft Office XP Developer Edition
  • Microsoft Access 2002 Standard Edition
  • Microsoft Excel 2002 Standard Edition
  • Microsoft FrontPage 2002 Standard Edition
  • Microsoft Outlook 2002 Standard Edition
  • Microsoft PowerPoint 2002 Standard Edition
  • Microsoft Word 2002 Standard Edition
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