The original Windows 95 disc is not bootable and you need to boot from a floppy disc to format the hard drive and then boot from the CD-Rom to install Windows, if you have a bootable Windows 95 installation disc you will need to run the fdisk command to format the hard disk first then you will be able to install Windows 95.
1-Boot from the Windows 95 disc
2-Select "Boot from CD-Rom"
3-Then select "Boot computer without CD-Rom support"
4-You should see the DOS command on the A:\
5-Type: fdisk and click on Ok
6-Follow the instructions to create a DOS partition then activate the partition
7-When finished, press Esc to exit the fdisk and then reboot your computer
8-Boot from the Windows 95 disc
9-Select "Boot from CD-Rom"
10-Then select "Boot computer with CD-Rom support"
11-You should see the DOS command, then run these commands:
C: (and press Enter)
md Win95 (and press Enter)
cd Win95 (and press Enter)
D: (and press Enter)
copy . C: (and press Enter)
12-When finished, you copied the installation files to the hard drive
13-Go back to the C:\Win95 and run the install.exe
14-Then you can remove the CD-Rom and follow the Windows installation guide