boot problem

ive put in a new hard drive with windows 98 in a old computer, its only got 20mb memory and a 486 at 50mhz, when i boot up it says
autotyping 0master,,, autotyping failed
system reconfigured
failure fixed disk 0
then an error code of acfg error8603fff
i do know that the hard drive is good, it works fine what is the problem?