Article ID: 225252 - Last Review: January 24, 2007 - Revision: 1.2

Error Message: Your Computer Already Has an Operating System Installed, Which Cannot Be Upgraded by This Version of Setup

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This article was previously published under Q225252

SYMPTOMS

When you try to upgrade your Microsoft Windows 95-based computer to Windows 98, you may receive the following error message:

Warning SU0168
Your computer already has an operating system installed, which cannot be upgraded by this version of Setup. Please obtain the Windows 98 Upgrade.

This issue can also occur if you try to upgrade with a full version. Before troubleshooting, ensure CD-ROM installation is Upgrade version.

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CAUSE

This issue can occur for either of the following reasons:

An incorrect version of the Setupx.dll file is currently loaded into memory.
Your installation media (CD-ROM or floppy disk) may be damaged.

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RESOLUTION

To resolve this issue:

Click Start, click Shutdown, click Restart the computer in MS-DOS mode, and then click OK.
At the command prompt, type the following commands, pressing ENTER after each command:
cd windows\system
ren setupx.dll setupx.ol1
ren setupx.w95 setupx.ol2
NOTE: If the Setupx.w95 file is missing, extract a new copy of the Setupx.dll file from the current operating system's installation media to the Windows\System folder. For additional information about how to extract files, click the article number below to view the article in the Microsoft Knowledge Base:
129605 (http://support.microsoft.com/kb/129605/EN-US/ ) How to Extract Original Compressed Windows Files
Type exit, and then press ENTER.
Click Start, click Run, type cdromdriveletter:\win98\setup.exe, and then click OK.