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The Windows Setup program allows you to use device drivers that are provided by hardware manufacturers. To use these drivers, you select the Other option, which requires a disk provided by the hardware manufacturer. Setup then prompts you for the disk or directory where the drivers are located. After finding the drivers in the specified path, Setup offers you a choice of the drivers that are available. When you choose an option, Setup makes the necessary changes to the SYSTEM.INI file.

If you follow the above procedure when installing a Microsoft Mouse, unpredictable results can occur. If, for example, you choose Other for the mouse and specify a directory where a MOUSE.DRV file is located, Setup presents the name of the driver for you to select. The name will be something like "Microsoft Mouse" or "Microsoft Mouse version 8.0." Selecting one of these options seems logical, but doing so can cause problems.

Some of the symptoms of this problem include Windows returning to the MS-DOS prompt after displaying the Windows logo, erratic or sluggish mouse movement in non-Windows applications that are run from Windows, or system hangs when returning to Windows from a non-Windows application that uses the mouse.

To eliminate this problem, choose a driver that Setup lists rather than the Other option. When using a Microsoft Mouse, you should choose the Microsoft, IBM PS/2 option.