The cheapest, and easiest is a crossover cable ($15), if you have a NIC (network card) in each computer. It is fast and your Windows XP computer will have the software to install onto your 98 computer to make it simple.
If you want down and dirty cheap, take the hard drive out of your 98 and install it into your XP computer and "Drag & Drop" the files onto your new XP computer. May sure you set the jumpers to SLAVE before installing the 98 on to the XP computer.
You could also use a USB data cable but they are rather expensive ($30 to $50). Don't use a standard USB cable, you will damage your computer's USB port, and may be the motherboard.
Edited by acklan, 22 June 2006 - 08:07 AM.