What is the exact error text?
[edit]
Your network installer has most likely modified your config files, so post those again.
If you still have these lines:
device=c:\net\nemm.dos
device=C:\NET\workgrp.sys
DEVICE=C:\net\tcpdrv.dos /I:c:\net
device=c:\net\ne2000.dos
you could try using 'devicehigh=' instead of 'device='
but really would prefer the new config, the exact error message, and where in the sequence it occurs.