installation failed

i have got this problem when i tried to install Redhat Enterprise Linux
WS in my box
my box has
256mb memory
80Gb hard disk
and 1.8 GHz processor
when i tried to install i get following error
"attempt to read sectors 2-3 outside of partition /dev/hda"
and again
"attempt to read sector 0-7 outside of partition /dev/hda"

please help
thanks in advance