Cannot Create Windows 98 Startup DiskID: Q178634 
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When you press the ENTER key on the Startup Disk tab in the Add/Remove Programs tool to create a Windows 98 Startup disk, the Add/Remove Programs Properties dialog box may close.
To create a Windows 98 Startup disk, use either of the following
methods on the Startup Disk tab in the Add/Remove Programs tool:
Microsoft has confirmed this to be a problem in Windows 98. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.
Keywords          : kbui win98 
Version           : WINDOWS:98
Platform          : WINDOWS 
Issue type        : kbprb 
Last Reviewed: January 30, 1999