When loading Win98SE to my new PC, I had serious problems with
my Realtek
RTL8029(AS) network card:
It was marked in the Device-Manager with a Yellow-mark and was
reporting "Code 10",
I got it finally to work using the the drivers from a download
last year:

Device-Manager is reporting for the RTL8029.SYS : File version:
3.29.98.0514

I have a copy of these drivers on my download-page.