The CONFIG.SYS file (by default) does not try to load the Windows client adapter drivers (packet driver, NDIS, or ODI) into upper memory. This can lead to applications reporting "not enough conventional memory" or a similar message when they start.
If you are running DOS 5.x or greater, change CONFIG.SYS lines from:
DEVICE=C:\PCNFSPRO\filename
to
DEVICEHIGH=C:\PCNFSPRO\filename
and NFSWAUTO.BAT lines that load TSRs from
tsrname
to
LH tsrname