I'm a newbie. After several hit-or-miss attempts, I finally succeeded in installing it (ha......quite a sense of achievement). The following are the specific steps: 1. Use undisker to open the decompressed DOS71-1.IMG (I only download 1.IMG, not 2.IMG), then select Image Properties (decompress to.....) to the root directory of drive E on the hard disk (any partition is okay, but it should be decompressed to the root directory, not to a folder, otherwise the installation process will prompt that "the instruction or file is bad". I can't explain the reason.). 2. Insert the Windows 98 installation CD, boot the computer from the start and enter the DOS prompt, type E:\setup, press Enter, and the DOS 7.10 installation program starts to run. Select the default all the way (if the default installation can't continue, then select another one). Done.........I hope it will be helpful to the owner........