W98 LAN – one way slow connection

Hello,
I have been happily using a 2machines (Celeron 400 and PIII 750) W98SE network at home for some years.

Recently, data tranfer Celeron 400 -> PIII is very slow.(Copies 2 Mbytes in 1 minute, Word 2000 saves 2Mbytes in 3 minutes !). The other way (PIII -> Celeron 400 )works fine.

My switch is 100base-Tx, network adapters accordingly. I changed the switch recently, but the problem existed before that.

I couldn’t figure this one out.

Thanks for your help.