If you install Windows 2000 or XP on a computer that already has Windows 98 installed, you are given the option to keep Windows 98 and have both operating systems available when you start your computer. Many people take this option, and decide later that they would rather remove Windows 98 to reclaim extra hard drive space. You can delete Windows 98 from your computer to create extra storage space after installing a newer version of Windows.
Log into Windows 98.
Click "Start," "Settings," and "Control Panel." Double click "Add/Remove Programs."
Click on each program, and click the "Add/Remove" button. Do this until every program is uninstalled.
Reboot the computer and log into the more recent Windows installation.
Double click the "My Computer" icon, then double click the hard drive that Windows 98 is installed on.
Right click on the "Windows" folder, and click "Delete." Note that newer versions of Windows are also installed in a folder called "Windows." It is important to be completely sure that you are deleting the correct folder. This operation removes Windows 98 from the computer.
Hit the Windows logo and "R" keys on the keyboard simultaneously to bring up the "Run" dialog box. In this box, type "sysdm.cpl" without the quotation marks and hit "Enter."
Click the "Advanced" tab. In the "Startup and Recovery" category, choose "Settings." Click the "Edit" button in the "System Startup" category. This brings up the "boot.ini" file.
Under "operating systems," remove the line for Windows 98. Click "File," then click "Save." Close the program. Windows 98 will no longer be displayed as a selectable operating system when your computer starts up.