Transfer of large amount of data

Will transfering large amount of data through a 10/100Mbps card to another via HUB cause a reboot? Mine did.
Had checked the IP address and installation to be in order. No, IRQ or resource conflicts.
Intel PIII 733MHz 256Meg SDRam Azus 815E motherboard Win98SE 300W powerunit 3 Harddisks & 1 DVD ROM.