For Win 3.11 you need to get hold of a set-up disk that will load the drivers. As it happens I have a set-up disk for a Samsung CD-ROM which includes the drivers. I'm pretty sure it will work for most CD's so if you want to try it then email me and I'll copy them to you. They're about 125kb in size.
I'm struggling a bit to remember the Win 95 set-up procedure but you need a boot disk click here and the CD drivers.