windows 98se and networking

I have 3 Pentum 100 systems the only difference is the mem 16,24 and 32 ine each sys. The issue is on a clean load the two with low mem will not get on a network, They can see them selfs on the network and one of there computer names show up, have checked the drivers one has a new nic, it is peer to peer and uses netbeui, the same sys had win98st and worked fine. Can any one shed some light?