It's a computer with Windows 3.1, and I don't have a mouse for it, only a keyboard. It has a diskette and cd opening, but I don't know if they can burn things. Also, there's no USB entrance.
Is there a way in which I can recover the data?
Take the hard drive out, find a USB - > IDE adapter (they are about $10-20 all over the place, usually with SATA, PATA (2.5" and 3.5") in one small device, very useful!)
Then plug it into any reasonable machine and copy the data off.
Filesystem will be FAT or FAT32 which Macs and Windows machines can all read fine today.
Should be a piece of cake.