You may actually have to remove screws to move it enough to see. There you will be given a number of icons to choose from. If you are on the internet on your 486, download to windows TEMP directory, then from TEMP activate setup. If not on same machine, save from TEMP to a diskette, then activate setup after copying files to 486. That usually gets the job done.
Some manufactures are now named something else or out of business, so it can be difficult.