If you have Win 95 or 98 on both PCs then you already have the ability to cable connect them. From Win 95 MS included a utility called 'Direct Cable Connection'. If it's not on the PC at the moment then can install it from the Windows disk.
You will need either a serial cable or a parallel cable (not just a printer cable because one end has a Centronics connector instead of a connector suitable for the other PCs parallel port).
I tend to use an older program that works under Win3.1 and can download & install itself via a serial cable. Damned handy when you don't have any disks with you!