When you attempt to reinstall or upgrade to Microsoft Visio 2000, the installer may quit unexpectedly, and then you receive the following error message where drive is the letter of your computer's CD-ROM or DVD-ROM drive.

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This behavior can occur if one of the following conditions is true:

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The CD-ROM or DVD-ROM drive letter has changed since you originally installed Visio 2000. For example, the letter for your CD-ROM or DVD-ROM drive may change after you install a second hard disk or a ZIP drive. -or-

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You have changed the drive letter of the hard disk that the operating system is installed on -- for example, drive C. The behavior described in the "Symptoms" section occurs because the Microsoft 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 has been changed, the registry keys refer to nonexistent folders, and therefore Setup is unsuccessful.

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To resolve this issue, re-assign the original letter to the CD-ROM, DVD-ROM, or operating system drive. To do this follow the steps appropriate to your operating system.

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Microsoft Windows NT 4.0

1.	Click Start, and then click Run.
2.	In the Run dialog box, type windisk.exe under Open, and then click OK to open Disk Administrator.
3.	Change the letter of the CD-ROM or DVD-ROM drive, or the drive that contains the operating system, back to its original letter, and then close Disk Administrator (accepting the changes).
4.	Restart your computer, and then install Visio.

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Microsoft Windows 2000

1.	Click Start, point to Settings, and then click Control Panel.
2.	In Control Panel, double-click Administrative Tools, and then double-click Computer Management.
3.	In the Computer Management tree, click Disk Management.
4.	Right-click the CD-ROM or DVD-ROM drive, or the drive that contains the operating system, and then click Change Drive Letter and Path.
5.	Click Edit, and then select the drive letter that you want. Click OK, and then click Close.

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For additional information, click the article numbers below to view the articles in the Microsoft Knowledge Base:

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