If the photos are stored on a floppy disk, then you'll need a Floppy Disk reader attached to PC in order to install it and a motherboard that supports attaching one or use a USB Floppy disk reader to connect it to a USB port.
There is no other way to transfer the files from the floppy disk without a dedicated reader.
You can find the mentioned devices on the Amazon, eBay or NewEgg.