How to get the mouse to work in MS-DOS
For a mouse to work in an MS-DOS environment, load the Microsoft mouse driver mouse.com in the autoexec.bat file or the mouse device driver mouse.sys loading in your config.sys file.
Find the MS-DOS mouse driver
Before placing any information into the Autoexec.bat and Config.sys, you need to locate one of those files on your computer. To locate a file in MS-DOS, type either of the commands below at C:\> prompt.
dir mouse.com /s
dir mouse.sys /s
Once either of these commands are typed in, a list of directories containing the file is shown. If you get a file not found error, try the alternate command.
Load mouse driver
Once the file is on the computer, follow the instructions below that correspond with the file that was found.
The above two lines are examples. If either file is located in another directory, you would substitute the C:\Windows\ for the directory containing the file.