With Windows 98 you may actually need the Windows 98 Startup Disk, it's just a floppy bootdisk with needed files and CD-ROM drivers. It can be freely downloaded at:
http://www.bootdisk.com/bootdisk.htm

To reinstall Windows 98 when using the Windows 98 Startup Disk:
1. Insert the Windows 98 Startup Disk, then turn the computer on.

Boot and install Windows 7 from USB Flash Drive

This is a small application (only 2.1MB) that allows you to convert your Windows installer CD/DVD to a bootable USB drive. Not only is it easy to use (nearly idiot-proof and does not require you to have any technical knowledge), it is also fully portable. No installation is required and you can bring it wherever you are.

Change the Number of Processors Used at Boot Up

Information:
If you have a multiple core CPU (e.g. Intel Core Duo or Quad CPU) or multiple CPUs, then this will show you how to change the Number of Processors that will be used during boot up for troubleshooting and debugging purposes to be able to determine if there is a problem with a single processor/core, or for a programmer to test their code against a single core while running on their multi-core system.